Circles & Composite Figures

The distance around an object is called the

• area

• perimeter or circumference

• volume

• surface area

A line that goes from edge to edge and through the center of a circle.

• Pi

• radius

• circumference

• diameter

What is the formula for finding radius?

What is the formula for finding diameter?

• r=2d

• d=2r

• d=2d

A circle has a radius of 4 inches. What is the diameter of this circle?

• 2 inches

• 6.28 inches

• 8 inches

• 12.56 inches

Find the circumference of a circle with a diameter of 12 mm.

• 37.68 mm.

• 75.36 mm.

• 18.84 mm

• 113.04 mm

What is the circumference of a circle with a radius of 12.7 m?

• 80 m

• 80.34 m

• 79.76 m

• 14.56 m

Find the circumference of the circle.

• 16 cm.

• 25.12 cm.

• 200.96 cm.

• 50.24 cm

Find the area of the circle.

• 43.96 units squared

• 87.82 units squared

• 153.86 units squared

• 307.72 units squared

Find the area of the circle.

• 251.2 cm.²

• 25.12 cm²

• 50.24 cm.²

• 200.96 cm²