Radius and Diameter

Front

What is the definition of a radius?

Back

The distance from the center of a circle to any point on its edge.

Front

What is the definition of a diameter?

Back

The distance from one edge of a circle to the opposite edge, passing through the center.

Front

If the radius of a circle is 5 cm, what is the diameter?

Back

10 cm (Diameter = 2 x Radius).

Front

What is the relationship between radius and diameter?

Back

The diameter is twice the length of the radius.

Front

If a circle has a diameter of 14 inches, what is the radius?

Back

7 inches (Radius = Diameter / 2).

Front

What is the formula for calculating the circumference of a circle using the diameter?

Back

Circumference = π x Diameter.

Front

What is the formula for calculating the area of a circle using the radius?

Back

Area = π x (Radius)².

Front

If the radius of a circle is doubled, how does the area change?

Back

The area increases by a factor of four.

Front

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

Back

Circumference = 2 x π x 3 m ≈ 18.85 m.

Front

What is the area of a circle with a radius of 4 ft?

Back

Area = π x (4 ft)² ≈ 50.27 ft².