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 value of π (pi) approximately?

Back

π is approximately 3.14.

Tags

CCSS.HSG.GMD.A.1

Front

If a circle has a radius of 5 inches, what is its circumference?

Back

Circumference = 2 × π × 5 = 31.4 inches.

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 a circle has a radius of 3 cm, what is its area?

Back

Area = π × 3² = 28.26 cm².

Tags

CCSS.7.G.B.4

Front

What is the diameter of a circle if the radius is 7 cm?

Back

Diameter = 2 × radius = 2 × 7 = 14 cm.

Tags

CCSS.7.G.B.4

Front

What is the circumference of a circle with a diameter of 9?

Back

Circumference = π × 9 = 9π.

Tags

CCSS.7.G.B.4

Front

If the diameter of a bowl is 14 cm, what is its circumference?

Back

Circumference = π × 14 = 43.98 cm.

Tags

CCSS.7.G.B.4

Front

What is the area of a circle with a radius of 4 cm?

Back

Area = π × 4² = 50.27 cm².

Tags

CCSS.7.G.B.4

Front

How do you convert radius to diameter?

Back

Diameter = 2 × radius.

Tags

CCSS.7.G.B.4