Area of a Circle

Front

What is the formula for the area of a circle?

Back

Area = πr², where r is the radius of the circle.

Tags

CCSS.7.G.B.4

Front

How do you find the radius if you are given the diameter?

Back

Divide the diameter by 2.

Tags

CCSS.7.G.B.4

Front

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

Back

Area = π(7)² = 154.0 (approximately).

Tags

CCSS.7.G.B.4

Front

What is the value of π (pi) approximately?

Back

π (pi) is approximately 3.14.

Tags

CCSS.HSG.GMD.A.1

Front

If a circle has an area of 78.5 square units, what is its radius?

Back

Radius = √(Area/π) = √(78.5/π) ≈ 5.

Tags

CCSS.7.G.B.4

Front

What is the relationship between diameter and radius?

Back

The diameter is twice the radius (Diameter = 2 × Radius).

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

Front

What is the area of a circle with a radius of 10 units?

Back

Area = π(10)² = 314.16 (approximately).

Tags

CCSS.7.G.B.4

Front

If a circle has a radius of 4, what is the area?

Back

Area = π(4)² = 50.27 (approximately).

Tags

CCSS.7.G.B.4

Front

What is the area of a circle with a diameter of 12 units?

Back

Radius = 12/2 = 6; Area = π(6)² = 113.1 (approximately).

Tags

CCSS.7.G.B.4