Area and Circumference of Circles

Front

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

Back

A = πr²

Tags

CCSS.7.G.B.4

Front

If my diameter is 19 inches, what is my radius?

Back

9.5 inches

Tags

CCSS.7.G.B.4

Front

What is the formula for finding the circumference of a circle with just the diameter?

Back

C = πd

Tags

CCSS.7.G.B.4

Front

If my radius is 10ft, what is my diameter?

Back

20ft

Tags

CCSS.7.G.B.4

Front

The diameter of a circle is 3 centimeters. What is the circumference?

Back

9.42 cm

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 value of π (pi) approximately?

Back

π ≈ 3.14

Tags

CCSS.HSG.GMD.A.1

Front

How do you calculate the circumference of a circle using the radius?

Back

C = 2πr

Tags

CCSS.7.G.B.4

Front

What is the area of a circle with a radius of 5 cm?

Back

A = π(5)² = 25π cm²

Tags

CCSS.7.G.B.4

Front

If the circumference of a circle is 31.4 cm, what is the radius?

Back

r = 5 cm (C = 2πr).

Tags

CCSS.7.G.B.4