1)Find the circumference and area of a circle with a diamater of 10 in. Round to the nearest hundredth. Do not forget the units! 2) What would be the radius.

Slides:

Advertisements

Similar presentations

Area and Circumference of Circles

Advertisements

Circumference & Arc Length. Circumference The distance around a circle C = 2r or d.

Circumference & Area of Circles Unit 5-3. Circumference Formula for Circumference: ** r is the radius ** ** 2r = d. d is the diameter. ** **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,

Areas of Segments of Circles SWBAT: To find the areas of segments of circles.

A Circle is a closed plane figure in which all the points are the same distance from the center. F Center Circle F.

Q1 of 36 Solve for x. Round to the nearest hundredths.  20 x 16.

6.7 Circumference & Area Notes. Circumference The distance around a circle. Do you remember the formula??? C = 2  r or C =  d * Always use the  button.

Warm-Up  Multiply.  1.89 x 97  x 76  x 34  4.38 x 28.

10/14/ : Circumference and Area of Circles 5.3: Circumferences and Areas of Circles Expectation: G1.6.1: Solve multistep problems involving circumference.

The area of the circle is about 227 m 2. COURSE 2 LESSON 8-4 Find the area of the circle to the nearest unit. = (8.5) 2 Substitute 8.5 for the radius.

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

Lesson 7-2 Circumference and Area of Circles. Definitions Circle - A set of points in a plane that are the same distance away from a given point in the.

Warm up: Solve for x 18 ◦ 1.) x 124 ◦ 70 ◦ x 2.) 3.) x 260 ◦ 20 ◦ 110 ◦ x 4.)

Warm up: Solve for x 1.) 2.) 4.) 3.) 124◦ 70◦ x 18◦ x 260◦ x 20◦ 110◦

Circumference of a Circle

6.7 Circumference & Arc Length p.224. Circumference Defn. – the distance around a circle. Thm – Circumference of a Circle – C = 2r or C = d *

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

Warm-Up Find the area: Circumference and Area Circles.

Warm Up April 24 th 1.What is the formula for the inscribed angle? 2.What is the formula for a vector outside the circle?

Circumference & Arc Length of Circles. 2 Types of Answers Rounded Put mode on classic Type the Pi button on your calculator Round Exact Put mode on mathprint.

Warm up: Solve for x 18 ◦ 1.) x 124 ◦ 70 ◦ x 2.) 3.) x 260 ◦ 20 ◦ 110 ◦ x 4.)

4-2: Chords and Arcs Unit 4: Circles English Casbarro.

SPI I CAN identify parts of a circle. I CAN find the circumference and area of a circle.

10-7 Surface Areas and Volumes of Spheres Two Theorems.

7.2 – Sectors of Circles Essential Question: How do you find the radius of a sector given its’ area and arc length?

11.5 Sectors and Arc Lengths

Warm-Up 1.Find the circumference of a circle with a diameter of 10ft. Round your answer to the nearest tenth. 2.Find the circumference of  A if the radius.

Warm up: Solve for x 18 ◦ 1.) x 124 ◦ 70 ◦ x 2.) 3.) x 260 ◦ 20 ◦ 110 ◦ x 4.)

Parts of a Circle & Circumference Textbook page 516 IAN page 120.

6.1 Angles and Radian Measure Objective: Change from radian to degree measure and vice versa. Find the length of an arc given the measure of the central.

EQ: How do you find the circumference of a circle? Lesson 4-6 Circumference pp Vocabulary to watch out for this lesson: Circle Center Diameter.

11.4 – Circumference and Arc Length. Circumference: C =  dC = 2  r Length around a circle.

Circumference The distance around a circle or Find the circumference to the nearest tenth

Half the circumference

Perimeter and Area of Circles and Sectors I CAN -Find the circumference and area of a circle -Find the arc length of a sector -Find the area of a sector.

Circles. Parts of a Circle Center The diameter is the distance across the circle through the center The radius is the distance to the center point.

OBJ: SWBAT USE THE FORMULA FOR CIRCUMFERENCE, USE ARC LENGTHS TO FIND MEASURES AND SOLVE REAL-LIFE PROBLEMS Circumference and Arc Length.

1. Assume that lines that appear tangent are tangent. Find the value of x.

Do Now Agenda Homework Handout (10 problems)  Do Do Now!

Warm up: Solve for x 1.) 2.) 4.) 3.) 124◦ 70◦ x 18◦ x 260◦ x 20◦ 110◦

Area of Circles & Sectors.

Rounding Decimals.

Circumference, Arc Length, Area, and Area of Sectors

Circles: Circumference & Area

Table of Contents 32. Circumference & Arc Length

EOC REVIEW Question of the Day.

6.7 Circumference and Arc Length.

2 Types of Answers Exact Rounded Use the Pi button on your calculator

Circumference, Arc Length, Area, and Area of Sectors

Arc Length Sector Area.

Warm-Up A circle has a diameter of 10 in. What is the arc length in radians of a sector with 135°? What is the arc length in radians of a sector with 95°?

Circles: Circumference & Area

Warm Up #1 Find each measure. Give answers in terms of  and rounded to the nearest hundredth. 1. area of sector LQM 7.5 in2  in2 2. Find the area.

Exact Area and Circumference of Circles

Name:________________ Date:_________________ Class Period:___________

The Distance Formula Use this formula to find the distance between the following two points.

DO NOW Complete number 6 (Area and Perimeter) on sheet 6-8.

Warm Up #1 Find each measure. Give answers in terms of  and rounded to the nearest hundredth. 1. area of sector LQM 7.5 in2  in2.

Volume of Prisms.

Sec Circumference and Arc Length p.649

Objectives Find arc lengths..

Circumference and Arc Length. Circumference and Arc Length.

Volume of Prisms. Volume of Prisms V = Bh B = area of BASE h = HEIGHT of the solid (use different formulas according to the shape of the base) h =

Circumference C = 2pr or pd. Circumference C = 2pr or pd.

Warm up: Solve for x 1.) 2.) 4.) 3.) 124◦ 70◦ x 18◦ x 260◦ x 20◦ 110◦

Warm up: Solve for x 1.) 2.) 4.) 3.) 124◦ 70◦ x 18◦ x 260◦ x 20◦ 110◦

Circle Review Bingo The solutions are linked. Click on the answer on the next slide and it will jump you to the slide that is the question to the solution.

Presentation transcript:

1)Find the circumference and area of a circle with a diamater of 10 in. Round to the nearest hundredth. Do not forget the units! 2) What would be the radius of a circle if the area is cm 2 ? C = in., A = in. 2 radius = 8 cm

Distance around the circle

C =  d C= 2  r

Find the circumference in terms of pi and to the nearest tenth

Portion of the circumference P A B

Your Turn: Find the length of AB. ( A B 150 o 34 cm.

Ex 2: Find the m LM. Notice that we are given the arc length and need to find the measure of the arc!! ( C L in. 8 in. Put in calc!! M

Your Turn: Find the m AB. ( C B m. 9 in. A

Ex 3: Find the circumference of circle C. 45 o 10.2 cm R S C Put in calc!!

Your Turn: Find the radius of circle C. READ the directions carefully!!! 45 o 1.57 ft R S C

Your Turn: Find the circumference of circle C. 200 o cm A B C