Cambridge University Press  G K Powers 2013 12. Similarity and right-angled triangles Study guide 1.

Slides:



Advertisements
Similar presentations
Trigonometry Ratios.
Advertisements

Trigonometric Ratios Please view this tutorial and answer the follow-up questions on loose leaf to turn in to your teacher.
1 7.2 Right Triangle Trigonometry In this section, we will study the following topics: Evaluating trig functions of acute angles using right triangles.
Trigonometry Review of Pythagorean Theorem Sine, Cosine, & Tangent Functions Laws of Cosines & Sines.
MTH 112 Elementary Functions Chapter 5 The Trigonometric Functions Section 2 – Applications of Right Triangles.
Measurment and Geometry
Terminal Arm Length and Special Case Triangles DAY 2.
Trigonometry Chapters Theorem.
Trigonometry can be used for two things: 1.Using 1 side and 1 angle to work out another side, or 2.Using 2 sides to work out an angle.
Trigonometry SOH CAH TOA.
EXAMPLE 1 Finding Trigonometric Ratios For PQR, write the sine, cosine, and tangent ratios for P. SOLUTION For P, the length of the opposite side is 5.
Where you see the picture below copy the information on the slide into your bound reference.
Lesson 1: Primary Trigonometric Ratios
TRIGONOMETRY BY: LOUIS ROSALES. WELCOME Here you will learn how to:  Identify certain parts of a right-angled triangle (hypotenuse, adjacent and opposite.
Geometry Notes Lesson 5.3B Trigonometry
Solving Right Triangles
Geometry Journal Chapter 7 & 8 By: Jaime Rich. A comparison of two numbers by division. An equation stating that two ratios are equal. You solve proportions.
Trigonometry v=t2uPYYLH4Zo.
3:2 powerpointmaths.com Quality resources for the mathematics classroom Reduce your workload and cut down planning Enjoy a new teaching experience Watch.
The Beginning of Trigonometry Trigonometry can be used to calculate the lengths of sides and sizes of angles in right-angled triangles. The three formulas:
Chapter 13 Sec 1 Right Triangle Trigonometry 2 of 12 Algebra 2 Chapter 13 Section 1 The ratios of the sides of the right triangle can be used to define.
TRIGONOMETRIC RATIOS Chapter 9.5. New Vocabulary  Trigonometric Ratio: The ratio of the lengths of two sides or a right triangle.  The three basic trigonometric.
Trigonometry.
Right Triangle Trigonometry
 Ratio: is the comparison of two numbers by division  Ratio of two numbers can be shown like this; a to b, a:b, or a/b  Proportion: equation that says.
 Ratio: Is a comparison of two numbers by division.  EXAMPLES 1. The ratios 1 to 2 can be represented as 1:2 and ½ 2. Ratio of the rectangle may be.
TRIGONOMETRY Lesson 1: Primary Trigonometric Ratios.
Bellringer Find the value of each variable. If your answer is not an integer, express it in simplest radical form 1. y=11 2. y= 9 √ √2 4. y=7 √3.
9.6 Sine and Cosine. CHIEF SOH-CAH-TOA SOH CAH TOA.
8.4 Trigonometric Ratios.
Geometry Trigonometry. Learning Outcomes I will be able to set up all trigonometric ratios for a right triangle. I will be able to set up all trigonometric.
The Right Triangle Right Triangle Pythagorean Theorem
Lesson 13.1 Right Triangle Trigonometry
Discuss how the following sequence of diagrams allows us to determine the height of the Eiffel Tower without actually having to climb it. Trigonometry.
Introduction to Trigonometry Part 1
Warm- up What do you remember about right triangles?
1 7.2 Right Triangle Trigonometry In this section, we will study the following topics: Evaluating trig functions of acute angles using right triangles.
Unit 7: Right Triangle Trigonometry
World 5-1 Trigonometric Ratios. Recall that in the past finding an unknown side of a right triangle required the use of Pythagoras theorem. By using trig.
____(0-10 pts) Describe a ratio. Describe a proportion. How are they related? Describe how to solve a proportion. Describe how to check if a proportion.
Trigonometry Chapter 7. Review of right triangle relationships  Right triangles have very specific relationships.  We have learned about the Pythagorean.
Right Triangle Trigonometry Ratios Must label the sides B A C From the marked angle… Hypotenuse- across from the right angle Adjacent – next to.
Chapter 13 Right Angle Trigonometry
LC8: TRIGONOMETRY 8C, 8D. MS. JELLISON, WHAT ARE WE DOING TODAY? 8C Label the sides of a right triangle as opposite, adjacent, and hypotenuse. 8D Apply.
5. Applications of trigonometry Cambridge University Press 1  G K Powers 2013.
Trigonometry can be used for two things: 1.Using 1 side and 1 angle to work out another side, or 2.Using 2 sides to work out an angle.
A Quick Review ► We already know two methods for calculating unknown sides in triangles. ► We are now going to learn a 3 rd, that will also allow us to.
9.3 Trigonometry: Sine Ratio
Trigonometry in Rightangled Triangles Module 8. Trigonometry  A method of calculating the length of a side Or size of an angle  Calculator required.
7.1 Geometric Mean 7.2 Pythagorean Theorem 7.3 Special Right Triangles 7.4 Trigonometry 7.5 Angles of Elevation & Depression 7.6 Law of Sines 7.7 Law of.
Lesson: Introduction to Trigonometry - Sine, Cosine, & Tangent
Trigonometric Ratios 8.2.
Tangent Ratio.
Right Triangle Trigonometry
Basic Trigonometry We will be covering Trigonometry only as it pertains to the right triangle: Basic Trig functions:  Hypotenuse (H) Opposite (O) Adjacent.
Warm Up(You need a Calculator!!!!!)
8-4 Trigonometry Ms. Andrejko.
Pythagoras’ Theorem and Trigonometry
Angles of Elevation and Depression
Objectives Find the sine, cosine, and tangent of an acute angle.
MM3 – Similarity of two-dimensional Figures, Right-Angled Triangles
Geometry Unit 8-5: The Tangent Ratio.
Finding a missing angle with inverse trigonometric functions
7-5 and 7-6: Apply Trigonometric Ratios
Unit 3: Right Triangle Trigonometry
Geometry 9.5 Trigonometric Ratios
Trigonometry To be able to find missing angles and sides in right angled triangles Starter - naming sides.
Trigonometry Olivia Miller.
Presentation transcript:

Cambridge University Press  G K Powers Similarity and right-angled triangles Study guide 1

Cambridge University Press  G K Powers 2013 Similar figures and scale factors  Similar figures are the same shape and have the same proportions but are different sizes.  Corresponding (or matching) angles of similar figures are equal.  Corresponding sides of similar figures are in the same ratio.  Scale factor is the amount of enlargement or reduction. HSC Hint – Matching sides in similar figures are opposite angles that are equal in size. 2

Cambridge University Press  G K Powers 2013 Problems involving similar figures 1. Read the question and underline key terms. 2. Draw similar figures and label the information from the question. 3. Use a pronumeral (x) to represent an unknown side. 4. Write an equation using two fractions formed from matching sides. 5. Solve the equation. 6. Check that the answer is reasonable HSC Hint – Always check whether the answer makes sense. Write the answer in words. 3

Cambridge University Press  G K Powers 2013 Scale drawing Scale of a drawing = Drawing length : Actual length Scale is expressed in two ways: 1. Using units such as 1 cm to 1 m. 2. No units such as 1:100. HSC Hint – Scale drawing questions may require a measurement using a ruler. 4

Cambridge University Press  G K Powers 2013 Naming the sides of a right triangle The hypotenuse is opposite the right angle, the opposite side is opposite the angle θ and the adjacent is the remaining side. HSC Hint – Label the sides of a right triangle by starting with the hypotenuse. 5

Cambridge University Press  G K Powers 2013 Trigonometric ratios  The mnemonic ‘SOH CAH TOA’ is used to determine the trigonometric ratio. SOH: Sine-Opposite-Hypotenuse CAH: Cosine-Adjacent-Hypotenuse TOA: Tangent-Opposite-Adjacent  The order of the letters matches the ratio of the sides. HSC Hint – Learn the mnemonic and use it when there is an angle and sides in a right-angled triangle. 6

Cambridge University Press  G K Powers 2013 Finding an unknown side 1. Name the sides of the triangle. 2. Use the given side and unknown side x to determine the trigonometric ratio. Use SOH CAH TOA. 3. Rearrange the equation to make the x the subject. 4. Use the calculator to find x. Remember to check the calculator is set up for degrees. 5. Write the answer to the specified level of accuracy. HSC Hint – Always show the trigonometric equation with the known values. 7

Cambridge University Press  G K Powers 2013 Finding an unknown angle 1. Name the sides of the triangle. 2. Use the given sides and unknown angle θ to determine the trigonometric ratio. Use SOH CAH TOA. 3. Rearrange the equation to make θ the subject. 4. Use the calculator to find θ. Remember to check the calculator is set up for degrees. 5. Write the answer to the specified level of accuracy. HSC Hint – To find an angle on the calculator use the SHIFT key to select sin -1, cos -1 or tan -1. 8

Cambridge University Press  G K Powers 2013 Applications of right-angled triangles 1. Read the question and underline the key terms. 2. Draw a diagram and label the information. 3. Use trigonometry to calculate a solution. 4. Check that the answer is reasonable and units are correct. 5. Explain the answer in words and ensure the question has been answered. HSC Hint – In addition to trigonometry some questions in right triangles require the use of Pythagoras’ theorem. 9

Cambridge University Press  G K Powers 2013 Angles of elevation and depression  The angle of elevation is the angle measured upwards from the horizontal.  The angle of depression is the angle measure downwards from the horizontal. HSC Hint – Angle of elevation is equal to the angle of depression as they form alternate angles. 10