Circumference and Area of Circles

Front

What is the definition of the diameter of a circle?

Back

The diameter of a circle is the distance across the circle through its center, equal to twice the radius.

Tags

CCSS.HSG.C.A.2

Front

What is the definition of the radius of a circle?

Back

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

Front

How do you calculate the circumference of a circle?

Back

Circumference = π × diameter or Circumference = 2 × π × radius.

Tags

CCSS.7.G.B.4

Front

What is the approximate value of π (pi)?

Back

π (pi) is approximately 3.14.

Tags

CCSS.HSG.GMD.A.1

Front

What is the formula for the area of a circle?

Back

Area = π × radius².

Tags

CCSS.7.G.B.4

Front

If a circle has a radius of 5 cm, what is its area?

Back

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

Tags

CCSS.7.G.B.4

Front

If a circle has a diameter of 10 m, what is its circumference?

Back

Circumference = π × 10 m ≈ 31.4 m (using π ≈ 3.14).

Tags

CCSS.7.G.B.4

Front

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

Back

Area = π × (4 cm)² = 50.24 cm² (using π ≈ 3.14).

Tags

CCSS.7.G.B.4

Front

How do you find the diameter if you know the radius?

Back

Diameter = 2 × radius.

Tags

CCSS.7.G.B.4

Front

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

Back

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

Tags

CCSS.7.G.B.4