Circumference and Area of Circles & Semi-Circles

Front

What is the definition of diameter?

Back

Distance across the circle through the center.

Front

What is the definition of radius?

Back

Distance from the center to any point on the circle.

Front

What is the formula for finding diameter?

Back

d = 2r.

Tags

CCSS.7.G.B.4

Front

What shape is created by folding a circle in half?

Back

Semi-circle.

Tags

CCSS.4.G.A.1

Front

If a bicycle tire has a diameter of 27 inches, what is the radius?

Back

13.5 inches.

Tags

CCSS.7.G.B.4

Front

What is the formula for the circumference of a circle?

Back

C = πd or C = 2πr.

Tags

CCSS.7.G.B.4

Front

What is the formula for the area of a circle?

Back

A = πr².

Tags

CCSS.7.G.B.4

Front

What is the relationship between diameter and radius?

Back

Diameter is twice the radius (d = 2r).

Tags

CCSS.7.G.B.4

Front

What is the circumference of a circle with a radius of 5 inches?

Back

C = 10π inches.

Tags

CCSS.7.G.B.4

Front

What is the area of a circle with a radius of 4 inches?

Back

A = 16π square inches.

Tags

CCSS.7.G.B.4