Radius, Diameter & Circumference SC

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 edge. It is half the diameter.

Front

What is the diameter of a circle?

Back

The diameter is the distance across the circle, passing through the center. It is twice the radius.

Front

What is the circumference of a circle?

Back

The circumference is the distance around the circle.

Front

How do you calculate the circumference of a circle?

Back

Circumference (C) can be calculated using the formula: C = 2πr, where r is the radius.

Front

What is the approximate value of pi (π)?

Back

Front

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

Back

The diameter is 10 cm, since diameter = 2 × radius.

Front

If the circumference of a circle is 31.4 cm, what is the radius?

Back

The radius is 5 cm, calculated using the formula: r = C/(2π).

Front

What is the relationship between radius and diameter?

Back

The diameter is always twice the radius.

Front

If the radius of a circle is doubled, what happens to the circumference?

Back

The circumference also doubles.

Front

What is the formula to find the radius if you know the circumference?

Back

The formula is r = C/(2π).