Circles: Area & Circumference

Front

What is the diameter of a circle?

Back

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

Tags

CCSS.HSG.C.A.2

Front

What is circumference?

Back

Circumference is the distance around a circle.

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 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 area of a circle?

Back

The area is the space inside the circle, calculated using the formula: Area = π × radius².

Tags

CCSS.7.G.B.4

Front

How do you calculate the area of a circle with a radius of 4 cm?

Back

Area = π × (4 cm)² = 50.24 cm².

Tags

CCSS.7.G.B.4

Front

If a circle has a diameter of 10 inches, what is its radius?

Back

The radius is 5 inches (half of the diameter).

Tags

CCSS.7.G.B.4

Front

What is the relationship between diameter and radius?

Back

The diameter is twice the radius.

Tags

CCSS.7.G.B.4

Front

How do you find the area of a circular pizza with a 10-inch diameter?

Back

First, find the radius (5 inches), then use the formula: Area = π × (5 inches)² ≈ 78.54 in².

Tags

CCSS.7.G.B.4

Front

What is the area of a square pizza with a side length of 9 inches?

Back

Area = side × side = 9 in × 9 in = 81 in².

Tags

CCSS.3.MD.C.7B

CCSS.4.MD.A.3