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 of the circle.

Tags

CCSS.7.G.B.4

Front

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

Back

Radius = Diameter ÷ 2.

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

If a circle has a diameter of 16 cm, what is its radius?

Back

Radius = 16 cm ÷ 2 = 8 cm.

Tags

CCSS.7.G.B.4

Front

What is the area of a circle with a radius of 8 cm?

Back

Area = π × (8 cm)² = 201.06 cm² (approximately).

Tags

CCSS.7.G.B.4

Front

What is the formula for the circumference of a circle?

Back

Circumference = π × d, where d is the diameter.

Tags

CCSS.7.G.B.4

Front

If a circle has a diameter of 11 mm, what is its circumference?

Back

Circumference = π × 11 mm ≈ 34.54 mm.

Tags

CCSS.7.G.B.4

Front

What is the relationship between diameter and circumference?

Back

Circumference = π × Diameter.

Tags

CCSS.7.G.B.4

Front

How do you convert diameter to radius?

Back

Divide the diameter by 2.

Tags

CCSS.7.G.B.4

Front

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

Back

Area = π × (5 cm)² = 78.5 cm² (approximately).

Tags

CCSS.7.G.B.4