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 value of π (pi) commonly used in calculations?

Back

π is approximately 3.14.

Tags

CCSS.HSG.GMD.A.1

Front

How do you find the circumference of a circle?

Back

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

Tags

CCSS.7.G.B.4

Front

If the radius of a circle is 7 cm, what is its area?

Back

Area = π × (7)² = 153.86 cm² (using π ≈ 3.14).

Tags

CCSS.7.G.B.4

Front

If the radius of a circle is 4.5 inches, what is the area?

Back

Area = π × (4.5)² ≈ 63.59 in² (using π ≈ 3.14).

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 diameter of 10 cm, what is its radius?

Back

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

Tags

CCSS.7.G.B.4

Front

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

Back

Area = π × (5)² = 78.5 cm² (using π ≈ 3.14).

Tags

CCSS.7.G.B.4

Front

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

Back

Circumference = 2 × π × 3 ≈ 18.84 cm (using π ≈ 3.14).

Tags

CCSS.7.G.B.4

Front

How do you convert radius to diameter?

Back

Multiply the radius by 2.

Tags

CCSS.7.G.B.4