Circumference and Area of Circles

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

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

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

Back

Radius = Diameter / 2 = 10 cm / 2 = 5 cm.

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 area of a semicircle?

Back

Area of semicircle = (π × r²) / 2.

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 radius of 4 cm, what is its area?

Back

Area = π × (4 cm)² = 50.24 cm².

Tags

CCSS.7.G.B.4

Front

What is the circumference of a circle with a radius of 3 m?

Back

Circumference = 2 × π × 3 m ≈ 18.84 m.

Tags

CCSS.7.G.B.4

Front

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

Back

Area = (Circumference / 2π)² × π.

Tags

CCSS.7.G.B.4

Front

What is the diameter of a circle with an area of 78.5 cm²?

Back

Diameter = 2 × √(Area / π) = 10 cm.

Tags

CCSS.7.G.B.4