Identify the Parts of a Circle

Front

What is the diameter of a circle?

Back

The diameter is the distance across a circle through its center, equal to twice the radius.

Tags

CCSS.HSG.C.A.2

Front

What is the radius of a circle?

Back

The radius is the distance from the center of the circle to any point on its circumference.

Front

What is the relationship between diameter and radius?

Back

The diameter is twice the length of the radius (d = 2r).

Tags

CCSS.7.G.B.4

Front

What is the formula for the circumference of a circle given the radius?

Back

C = 2πr.

Tags

CCSS.7.G.B.4

Front

What is the formula for the circumference of a circle given the diameter?

Back

C = πd.

Tags

CCSS.7.G.B.4

Front

If the radius of a circle is 10 m, what is the diameter?

Back

The diameter is 20 m.

Tags

CCSS.7.G.B.4

Front

If the diameter of a circle is 30 m, what is the radius?

Back

The radius is 15 m.

Tags

CCSS.7.G.B.4

Front

What is the area of a circle?

Back

The area is given by the formula A = πr².

Tags

CCSS.7.G.B.4

Front

How do you find the radius if you know the circumference?

Back

Use the formula r = C/(2π).

Tags

CCSS.7.G.B.4

Front

How do you find the diameter if you know the area?

Back

Use the formula d = 2√(A/π).

Tags

CCSS.7.G.B.4