Identify the Parts of a Circle

Front

What is the Radius of a Circle if the Diameter is 10?

Back

5

Front

What is the diameter of a circle?

Back

The diameter is the distance across the circle through its center.

Front

What is a straight line passing from side to side through the center of a circle?

Back

Diameter

Front

Determine the radius of a penny if its diameter is 19 mm.

Back

9.5 mm

Front

What is a straight line from the center to the circumference of a circle?

Back

Radius

Front

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

Back

Circumference = π × Diameter

Front

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

Back

Area = π × (3 cm)² = 28.27 cm²

Front

What do you call the distance around a circle?

Back

Circumference

Front

If the radius of a circle is 4 cm, what is the diameter?

Back

Diameter = 2 × Radius = 8 cm

Front

What is the relationship between diameter and radius?

Back

Diameter = 2 × Radius