Circumference and Area in terms of pi

Front

What is the formula for the circumference of a circle?

Back

C = πd or C = 2πr, where d is the diameter and r is the radius.

Tags

CCSS.7.G.B.4

Front

What is the formula for the area of a circle?

Back

A = πr², where r is the radius.

Tags

CCSS.7.G.B.4

Front

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

Back

The radius is 5 cm.

Tags

CCSS.7.G.B.4

Front

What is the value of π (pi) approximately?

Back

π is approximately 3.14.

Tags

CCSS.HSG.GMD.A.1

Front

How do you calculate the circumference of a circle with a radius of 7 cm?

Back

C = 2πr = 2 × 3.14 × 7 = 43.96 cm.

Tags

CCSS.7.G.B.4

Front

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

Back

A = πr² = 3.14 × 4² = 50.24 cm².

Tags

CCSS.7.G.B.4

Front

If a circle has a circumference of 31.4 cm, what is its diameter?

Back

The diameter is 10 cm.

Tags

CCSS.7.G.B.4

Front

What is the relationship between diameter and radius?

Back

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

Tags

CCSS.7.G.B.4

Front

How do you find the area of a circle if you know the diameter?

Back

First, find the radius (r = d/2), then use A = πr².

Tags

CCSS.7.G.B.4

Front

What is the circumference of a circle with a diameter of 12 feet?

Back

C = πd = 3.14 × 12 = 37.68 feet.

Tags

CCSS.7.G.B.4