circles. 2 circle: plane figure not a polygon not made up of line segments

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Circles

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Page 1: Circles. 2 Circle: Plane figure Not a polygon Not made up of line segments

Circles

Page 2: Circles. 2 Circle: Plane figure Not a polygon Not made up of line segments

2

Circle:

• Plane figure• Not a polygon• Not made up of line segments

Page 3: Circles. 2 Circle: Plane figure Not a polygon Not made up of line segments

3

Diameter:

• Longest chord, line, in a circle

Page 4: Circles. 2 Circle: Plane figure Not a polygon Not made up of line segments

4

Radius

• Line segment with one endpoint at the center of the circle and the other endpoint on the circle.

• Half of the Diameter

Page 5: Circles. 2 Circle: Plane figure Not a polygon Not made up of line segments

5

Area:

•A = r

Page 6: Circles. 2 Circle: Plane figure Not a polygon Not made up of line segments

6

Find the area

77 cm

Page 7: Circles. 2 Circle: Plane figure Not a polygon Not made up of line segments

7

Find the area

12 m

Page 8: Circles. 2 Circle: Plane figure Not a polygon Not made up of line segments

8

Find the area

24 cm

Page 9: Circles. 2 Circle: Plane figure Not a polygon Not made up of line segments

9

Find the area

• 56 ft

Page 10: Circles. 2 Circle: Plane figure Not a polygon Not made up of line segments

10

Circumference:

• Distance around a circle• C = d• C = 2 r

Page 11: Circles. 2 Circle: Plane figure Not a polygon Not made up of line segments

11

Find the circumference

77 cm

Page 12: Circles. 2 Circle: Plane figure Not a polygon Not made up of line segments

12

Find the circumference

12 m

Page 13: Circles. 2 Circle: Plane figure Not a polygon Not made up of line segments

13

Find the circumference

24 cm

Page 14: Circles. 2 Circle: Plane figure Not a polygon Not made up of line segments

14

Find the circumference

• 56 ft

Page 15: Circles. 2 Circle: Plane figure Not a polygon Not made up of line segments

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All About Words

Page 16: Circles. 2 Circle: Plane figure Not a polygon Not made up of line segments

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Word Problems

• A circular shield has a diameter of 20 inches. Find the area of the steel needed to cover one side of the shield.

Page 17: Circles. 2 Circle: Plane figure Not a polygon Not made up of line segments

17

Word Problems

• A pizza recipe calls for the dough to be rolled out to form a circle with a diameter of 18 inches. Find the area of the dough when it is rolled out.

Page 18: Circles. 2 Circle: Plane figure Not a polygon Not made up of line segments

18

Word Problems

• The diameter of a circle that a shot-putter stands in is 7 feet. What is the area of the circle?

Page 19: Circles. 2 Circle: Plane figure Not a polygon Not made up of line segments

19

Word Problems

• Meteor Crater in central Arizona was formed when an asteroid struck Earth between 20,000 and 50,000 years ago. The circular crater has a diameter of 1.2 kilometers. Find the area of the crater to the nearest hundredth.

Page 20: Circles. 2 Circle: Plane figure Not a polygon Not made up of line segments

20

Word Problems

• An architect is making a plan for a new circular theater. The diameter of the theater is 32 meters. What is the circumference?

Page 21: Circles. 2 Circle: Plane figure Not a polygon Not made up of line segments

21

Word Problems

• A builder is putting in a circular window. What is the circumference if the diameter is 4 feet?

Page 22: Circles. 2 Circle: Plane figure Not a polygon Not made up of line segments

22

Word Problems

• A builder is putting in a circular window. What is the circumference if the radius is 2 feet?

Page 23: Circles. 2 Circle: Plane figure Not a polygon Not made up of line segments

23

Word Problems

• A gardener is digging a circular pond. If the diameter of the pond is 5 yards. What is the circumference?

Page 24: Circles. 2 Circle: Plane figure Not a polygon Not made up of line segments

24

Word Problems

• The first Hula Hoop was introduced in 1958. What is the circumference of a Hula Hoop with a 3 foot diameter?

Page 25: Circles. 2 Circle: Plane figure Not a polygon Not made up of line segments

25

Word Problems

• The circumference of a circle is 24 meters. Find the diameter.

Page 26: Circles. 2 Circle: Plane figure Not a polygon Not made up of line segments

26

Word Problems

• Stan needs a new bicycle tire. His tire has a circumference of about 113.04 inches. What is the diameter of the tire?

Page 27: Circles. 2 Circle: Plane figure Not a polygon Not made up of line segments

27

Word Problems

• Billy Bob needs a new Hula Hoop. His Hula Hoop has a circumference of about 42.39 feet. What is the diameter of the Hula Hoop?

Page 28: Circles. 2 Circle: Plane figure Not a polygon Not made up of line segments

28

Word Problems

• The circumference of a circle is 4

What is the area? Leave your answer in terms of pi.

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