Circles - Circumference and Area

Front

What is the circumference of a circle?

Back

The circumference is the distance around the circle.

Front

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

Back

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

Tags

CCSS.7.G.B.4

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 the distance across the circle through its center, equal to twice the radius.

Tags

CCSS.HSG.C.A.2

Front

What is the area of a circle?

Back

The area is the space contained within the circle.

Front

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

Back

Area = π × radius².

Tags

CCSS.7.G.B.4

Front

If a circle has a radius of 7 cm, what is its area? Use 3.14 for pi.

Back

Area = 3.14 × 7² = 153.86 cm².

Tags

CCSS.7.G.B.4

Front

If a circle has a diameter of 10 cm, what is its circumference? Use 3.14 for pi.

Back

Circumference = π × diameter = 3.14 × 10 = 31.4 cm.

Tags

CCSS.7.G.B.4

Front

What do you need to measure to find out how much material is needed to cover a circular table?

Back

You need to measure the area of the circle.

Front

What do you need to measure to find out how much ribbon is needed to go around a circular frame?

Back

You need to measure the circumference of the circle.