Area of Circles

Front

What is the formula to calculate the area of a circle?

Back

Area = π × r², where r is the radius of the circle.

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

What is the radius of a circle?

Back

The radius is the distance from the center of the circle to any point on its circumference.

Front

What is the diameter of a circle?

Back

The diameter is twice the length of the radius and is the distance across the circle through its center.

Tags

CCSS.HSG.C.A.2

Front

If the radius of a circle is 3, what is the area?

Back

Area = π × (3)² = 28.26 (approximately).

Tags

CCSS.7.G.B.4

Front

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

Back

The radius is 5, since the radius is half of the diameter.

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 circumference of a circle?

Back

Circumference = 2 × π × r.

Tags

CCSS.7.G.B.4

Front

What is the area of a circle with a radius of 7?

Back

Area = π × (7)² = 153.86 (approximately).

Tags

CCSS.7.G.B.4

Front

What does it mean if a circle has a larger area?

Back

A larger area indicates a larger radius or diameter, meaning the circle is bigger.