Circles: Area & Circumference

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) commonly used in calculations?

Back

π (Pi) is approximately 3.14.

Tags

CCSS.HSG.GMD.A.1

Front

How do you calculate the area of a circle?

Back

Area = π × radius².

Tags

CCSS.7.G.B.4

Front

If a circle has a radius of 10 cm, what is its area?

Back

Area = π × (10 cm)² = 314 cm².

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

If the diameter of a circle is 12 cm, what is the radius?

Back

Radius = diameter ÷ 2 = 12 cm ÷ 2 = 6 cm.

Tags

CCSS.7.G.B.4

Front

What is the circumference of a circle with a radius of 5 inches?

Back

Circumference = 2 × π × 5 inches = 31.4 inches.

Tags

CCSS.7.G.B.4

Front

How do you find the difference in circumferences of two circles?

Back

Calculate the circumference of each circle and subtract the smaller from the larger.

Tags

CCSS.7.G.B.4

Front

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

Back

Area = π × (3 m)² = 28.26 m².

Tags

CCSS.7.G.B.4

Front

If a pizza has a radius of 9.5 inches, what is its area?

Back

Area = π × (9.5 inches)² ≈ 283.53 in².

Tags

CCSS.7.G.B.4