+ Bell Work Solve 25 ⅚ -18 ⅜ 5 ⅛ + 7 ⅘. + Bell Work Answer 25 ⅚ -18 ⅜ 25 20/24 – 18 9/24 7 11/24 5 ⅛ + 7 ⅘ 5 5/40 + 7 32/40 12 37/40.

Slides:

Advertisements

Similar presentations

Using Formulas in Geometry

Advertisements

Using Formulas in Geometry

Using Formulas in Geometry

1 of 84 S HAPE AND S PACE Circles. 2 of 84 L ET US DEFINE C IRCLE A ___________is a simple shape that is the set of all points in a plane that are at.

Definition: A circle is the set of all points on a plane that is a fixed distance from the center.

Perimeter Rectangles, Squares, and Triangles Perimeter Measures the distance around the edge of any flat object. To find the perimeter of any figure,

Area and Circumference of Circles

Perimeter & Area Section 6.1.

Bell Work: Solve: 3 x = 1 3 x = Answer: x = 5/12.

1. 2 Circle A circle is the set of all points that are the same distance from a given point called the center.

Circles: Area and Circumference. Definitions Circumference: Distance around the outside of a circle Area: How many squares it takes to cover a circle.

  investigate the relationship between the diameter and circumference of a circle.

Circle Formulas Vocabulary: Circumference Radius Diameter Pi.

Target Apply formulas for perimeter, area, and circumference.

Math Circumference of Circles & Area of Circles. Vocabulary A circle is the set of all points in a plane that are the same distance from a given point,

$100 Area of Parallelograms Area of Triangles Perimeter And Area Area of Trapezoids Area of Compound Figures & Area and Circumference of Circles $200.

8-1C The Circumference of a Circle What is circumference? What is pi? What is the symbol for pi? What are the formulas for the circumference of a circle?

Facts about Area of Shapes Dr. Kent Bryant 5/2011.

Section Using Formulas in Geometry Holt McDougal Geometry

Perimeter and Circumference

Circumference and Area: Circles

8.7 Circumference and Area of Circles. Definition  A circle is the set of all points in a plane that are the same distance from a given point, called.

Objective Apply formulas for perimeter, area, and circumference.

Objective Apply formulas for perimeter, area, and circumference.

Circumference and area of circles Pick up your calculator for today’s notes.

LESSON 7.6 AREA AND CIRCUMFERENCE OF CIRCLES OBJECTIVE: To use formulas for the circumference and area of circles.

Circumference & Area of a Circle

Circles. Center Radius Radii Diameter Chord.

Note 2: Perimeter The perimeter is the distance around the outside of a shape. Start at one corner and work around the shape calculating any missing sides.

Math Education Educational Technology EDU 529 Jun 30, 2003 David Bloom.

Circles: Circumference & Area Tutorial 8c A farmer might need to find the area of his circular field to calculate irrigation costs.

Chapter 4 L4-5 Notes: Perimeter. Vocabulary The distance around any closed figure is called its perimeter. P for “Plus” all Sides.

Perimeter & Circumference Return to table of contents.

Splash Screen. Over Lesson 11–6 5-Minute Check 1.

Circumference Lesson #33. What is Circumference? The distance around the outside of a circle is called the circumference (essentially, it is the perimeter.

Warm Up Evaluate. Round to the nearest hundredth

Geometry – Circles.  Circles are shapes made up of all points in a plane that are the same distance from a point called the center.  Look at this example.

Area and Perimeter.

Introduction & Installation. Circles A circle is a shape with all points the same distance from the center. A circle is named by the center. The circle.

Finding Perimeter and Area Review. Perimeter The distance around the outside of an object. 10 feet 8 feet 10 feet Perimeter = = 36 feet.

CIRCLES CIRCUMFERENCE & AREA. CIRCUMFERENCE C = ΠdorC = 2Πr 12cm.

By: Kay McInnis. Diameter DIAMETER is the distance across a circle passing through the center point.

1.7 - Find Perimeter, Circumference, and Area. Perimeter: Length around a shape. Measured in u cm, in, ft, yd.

Circumference of a Circle Objective: Investigate & explain the relationships among radius, diameter, and circumference.

Perimeter, Circumference and Area. Perimeter and Circumference Perimeter : The distance around a geometric figure. Circumference: The distance around.

Find the distance between the points below (9, 0) and (5,2) Find the length of the hypotenuse if the length of the legs are 4 and 2.

Slide 1 Copyright © 2015, 2011, 2008 Pearson Education, Inc. Perimeter Section9.2.

Circles: Circumference What do we call the measure of the perimeter of a circle or the distance around a circle? circumference.

Geometry CH 1-5 Good Definitions TOOLS OF GEOMETRY : LESSON 1-5 End of Lecture / Start of Lecture mark.

Holt McDougal Geometry 1-4 Pairs of Angles WARM-UP – 4 Points Calculate x, y, and z 44°y+40 9x+91 h z.

Circumference and Area of Circles Section 8.7. Goal Find the circumference and area of circles.

Measurement. Introduction There are many different ways that measurement is used in the real world. When you stand on a scale to see how much you weigh,

© 2010 Pearson Prentice Hall. All rights reserved Circles § 7.7.

Holt Geometry 1-5 Using Formulas in Geometry Warm Up Evaluate. Round to the nearest hundredth () 6. (3) 2.

Holt McDougal Geometry 1-5 Using Formulas in Geometry 1-5 Using Formulas in Geometry Holt Geometry Warm Up Warm Up Lesson Presentation Lesson Presentation.

Circles Shape and Space. The value of π For any circle the circumference is always just over three times bigger than the radius. The exact number is called.

Lesson 8.7 Concept: How to find the circumference of a circle. Guidelines: *The diameter of a circle extends from one side of the circle to the other.

Bell Work: Simplify 3√5√5. Answer: 15 LESSON 79: TRANSFORMING FORMULAS.

G-11 (1-5) Using formulas in Geometry I can use formulas to compute perimeter and area of triangles, squares, rectangles, and circles.

Using Formulas in Geometry

Using Formulas in Geometry

Using Formulas in Geometry

Objective Apply formulas for perimeter, area, and circumference.

Using Formulas in Geometry

Using Formulas in Geometry

Happy Friday!!! Please take out some paper to take notes on today lesson. Be ready to begin class when the bell rings.

Using Formulas in Geometry

Presentation transcript:

+ Bell Work Solve 25 ⅚ -18 ⅜ 5 ⅛ + 7 ⅘

+ Bell Work Answer 25 ⅚ -18 ⅜ 25 20/24 – 18 9/ /24 5 ⅛ + 7 ⅘ 5 5/ / /40

+ Lesson 3: Perimeter and Circumference

+ What is a perimeter?

+ Perimeter* The distance around an object.

+ Find the perimeter of this object

+ Answer: 28 Units

+ Find the perimeter of the object

+ Answer: 44 Units

+ Every point on a circle is the same distance from the center of the circle. This distance is called the radius. Radius*: The straight line from the center of the circle to the outer edge.

+ Diameter*: Twice the length of the radius of a circle.

+ Circumference*: The perimeter of a circle.

+ Many ancients thought that the circle was the perfect geometric figure. They were especially interested in the relationship between the diameter of a circle and the circumference of the same circle. They found that it takes approximately 3.14 diameters to go all the way around a circle no matter how small or large the circle is.

+ We now know the exact number of times the diameter will go around a circle. This exact number is a number is a number we call pi (pronounced pie). We represent pi with the symbol π.

+ π is an infinite number meaning that it will go on and on forever. This also means that it is an irrational number. A calculator gives a decimal approximation of π as (In the book, 3.14 will be used as an approximation for pi when doing calculations.)

+ It takes π diameters to equal the circumference of a circle. Circumference = πD

+ It takes 2π radii to equal the circumference of a circle. Circumference = 2πr

+ Example: The radius of a circle is 3 cm. Find the circumference of the circle.

+ Answer: Circumference = 2πr = 2π(3 cm) = 2(3.14)(3 cm) = cm

+ Example: The circumference of a circle is 24 meters. Find the radius of the circle.

+ Answer: Circumference = 2πr 24 m = 2πr 24 m = 2(3.14)(r) 24 m = 6.28r r = 3.82m

+ Find the perimeter of the figure

+ Answer: Perimeter = 10 ft +10 ft + 8 ft + (2π(4 ft)/2) = 28 ft + (2(3.14)(4 ft)/2) = 28 ft ft = ft

+ Practice: The length of a rectangle is 10 cm. The width of the rectangle is 5 cm. Find the perimeter of the rectangle.

+ Practice: The perimeter of a square is 12 meters. What is the length of one side of the square?

+ Practice: The radius of a circle is 5 inches. Find the circumference of the circle.

+ HW: Lesson 3 #1-30 Due Tomorrow