Circles Warm-up

What is the ratio used to find pi?

• circumference / diameter

• circumference / radius

• radius / diameter

• diameter / radius

What TWO values are accepted approximations for pi?

• 3/14

• 22/7

• 22.7

• 3.14

Which line(s) show a radius of the circle? Choose ALL correct answers.

• AD

• BC

• AC

• DC

Which line(s) show a diameter of the circle? Choose ALL correct answers.

• AD

• BC

• AC

• DC

Which line(s) show an arc of the circle? Choose ALL correct answers.

• AD

• BC

• AC

• DC

Find the circumference of the circle.

• 37.68 cm

• 75.36 cm

• 452.16 cm

• 1,808.64 cm

Find the area of the circle.

• 34.54 cm²

• 379.94 cm²

• 94.985 cm²

• 69.08 cm²

If the circumference of a circle is 43.96 in, what is the diameter of the circle?

• 14 in

• 7 in

• 28 in

• 138.0344 in

A circular roller derby rink has a diameter of 95 feet. If a roller derby player skates five laps around the rink, how far has she traveled?

• 475 ft

• 2983 ft

• 1491.5 ft

• 745.75 ft