Geometry Warm Up

10-6 CIRCLES AND ARCSObjective: To find the circumference and arc length.

Circumference• Circumference: the distance around the circle• Pi: ratio of the circumference of a circle to it’s diameter

pi• The number pi is irrational

Coplanar circles• Concentric circles: coplanar circles that have the same

center.

Problem 1

Try with a partner

Arc Length

Problem 2• What is the length of each arc shown in red? • Leave your answer in terms of

Problem 3• What is the length of a semicircle with radius 1.3 m? leave

your answer in terms of .

TOO

Homework• Pg. 654 # 24 – 36, 52 – 54