Circles-diameter & radius

Front

What is the definition of a radius in a circle?

Back

The radius is the distance from the center of the circle to any point on the circle.

Front

What is the relationship between the radius and diameter of a circle?

Back

The diameter is twice the length of the radius.

Front

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

Back

20 cm.

Front

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

Back

Diameter = 2 × Radius.

Front

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

Back

Radius = Diameter / 2.

Front

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

Back

7 m.

Front

True or False: The diameter of a circle is always longer than the radius.

Back

True.

Front

What is the distance across a circle through its center called?

Back

Diameter.

Front

If a circle has a radius of 3 inches, what is the circumference? (Use π ≈ 3.14)

Back

Circumference = 2 × π × Radius = 2 × 3.14 × 3 = 18.84 inches.

Front

What is the area of a circle with a radius of 4 cm? (Use π ≈ 3.14)

Back

Area = π × Radius² = 3.14 × 4² = 50.24 cm².