Circumference and Area of Circles

Front

What is the formula for the circumference of a circle?

Back

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

Tags

CCSS.7.G.B.4

Front

What is the formula for the area of a circle?

Back

Area = π × radius².

Tags

CCSS.7.G.B.4

Front

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

Back

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

Tags

CCSS.7.G.B.4

Front

What is the circumference of a circle with a diameter of 40 in?

Back

125.6 in.

Tags

CCSS.7.G.B.4

Front

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

Back

Area = π × 7² ≈ 153.94 cm².

Tags

CCSS.7.G.B.4

Front

What does the term 'diameter' refer to in a circle?

Back

The distance from an edge of a circle to another edge through the center.

Front

What is the circumference of a circle with a diameter of 56 m?

Back

175.8 m.

Tags

CCSS.7.G.B.4

Front

What is the relationship between diameter and radius?

Back

Radius is half of the diameter.

Tags

CCSS.7.G.B.4

Front

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

Back

Circumference = 2 × π × 3 m ≈ 18.85 m.

Tags

CCSS.7.G.B.4

Front

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

Back

Area = π × (6 m)² ≈ 113.10 m².

Tags

CCSS.7.G.B.4