Area of a Circle

Front

What is the formula for the area of a circle?

Back

A = πr²

Tags

CCSS.7.G.B.4

Front

What does 'r' represent in the area formula A = πr²?

Back

The radius of the circle.

Tags

CCSS.7.G.B.4

Front

If the radius of a circle is 8 units, what is the area?

Back

A = π(8)² = 64π ≈ 201.06 square units.

Tags

CCSS.7.G.B.4

Front

What is the circumference of a circle with a diameter of 10 mi?

Back

Circumference = πd = π(10) ≈ 31.4 mi.

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

How do you find the area of a composite figure that includes a circle?

Back

Calculate the area of the circle using A = πr² and add it to the area of other shapes.

Front

What is the approximate value of π?

Back

π ≈ 3.14.

Tags

CCSS.HSG.GMD.A.1

Front

If the area of a circle is 36π square units, what is the radius?

Back

Radius = √(Area/π) = √(36) = 6 units.

Tags

CCSS.7.G.B.4

Front

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

Back

A = π(5)² = 25π ≈ 78.54 cm².

Tags

CCSS.7.G.B.4

Front

What is the area of a circle with a radius of 3 ft?

Back

A = π(3)² = 9π ≈ 28.27 ft².

Tags

CCSS.7.G.B.4