CIRCLES Lesson 9 6 Circles l A circle

CIRCLES Lesson 9 -6

Circles l. A circle is a set of points that are the same distance from a given point, called the center

Circles Circumference—the distance around The circle

Circles Circumference—the distance around the circle Chord—a segment whose endpoints are on the circumference.

Circles Circumference—the distance around the circle Diameter—the longest chord in a circle. It passes through the center. Chord—a segment whose endpoints are on the circumference.

Circles Circumference—the distance around the circle Diameter—the longest chord in a circle. It passes through the center. Chord—a segment whose endpoints are on the circumference. Radius—A segment that has one endpoint in the center and the other endpoint on the circumference. It is half the length of the diameter.

Circles l When measuring parts of circles, we often use a constant called pi. It is a greek letter that has a value of approximately 3. 14 and it looks like this:

Circles l The circumference of a circle is pi multiplied by the diameter.

Circles l The circumference of a circle if pi multiplied by the diameter. l What is the circumference of a circle whose diameter is 7 cm? C = 3. 14 (7) C = 21. 98 cm

Try This l Find the circumference when given the following: ld = 12 inches lr = 2 feet

Try This l Find the circumference when given the following: ld = 12 inches lr = 2 feet 37. 68 inches

Try This l Find the circumference when given the following: ld = 12 inches 37. 68 inches lr = 2 feet 12. 56 feet

Try This l Find the circumference: 5 cm 5 in

Try This l Find the circumference: 5 cm 5 in 15. 7 cm

Try This l Find the circumference: 5 cm 5 in 15. 7 cm 31. 4 in