Circles - Area and Circumference

Front

What is the formula for the circumference of a circle?

Back

Circumference = 2 × π × r, where r is the radius.

Tags

CCSS.7.G.B.4

Front

What is the formula for the area of a circle?

Back

Area = π × r², where r is the radius.

Tags

CCSS.7.G.B.4

Front

If the radius of a circle is 7 inches, what is the circumference?

Back

Circumference = 2 × π × 7 ≈ 43.98 inches.

Tags

CCSS.7.G.B.4

Front

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

Back

Area = π × 10² ≈ 314.16 cm².

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 find the radius if you know the area of a circle?

Back

Radius = √(Area/π).

Tags

CCSS.7.G.B.4

Front

What is the relationship between diameter and radius?

Back

Diameter = 2 × Radius.

Tags

CCSS.7.G.B.4

Front

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

Back

Radius = Circumference / (2 × π) ≈ 5 inches.

Tags

CCSS.7.G.B.4

Front

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

Back

Diameter = 2 × 4 = 8 cm.

Tags

CCSS.7.G.B.4

Front

How do you convert circumference to diameter?

Back

Diameter = Circumference / π.

Tags

CCSS.7.G.B.4