Circle Vocab

Front

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

Back

Circumference = π × d (where d is the diameter)

Front

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

Back

The diameter is 20 ft (Diameter = 2 × radius)

Front

What is the radius of a circle with a diameter of 10 ft?

Back

The radius is 5 ft (Radius = diameter / 2)

Front

What does the formula πr² represent?

Back

The area of a circle.

Front

What is the area formula for a semi-circle?

Back

Area = (1/2) × πr²

Front

What is the relationship between diameter and radius?

Back

Diameter = 2 × radius.

Front

What is π (pi) approximately equal to?

Back

π is approximately equal to 3.14.

Front

How do you find the area of a circle?

Back

Use the formula Area = πr².

Front

What is the circumference of a circle with a diameter of 8 ft?

Back

Circumference = π × 8 ft ≈ 25.12 ft.

Front

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

Back

Area = π × (3 cm)² ≈ 28.27 cm².