ADV Circumference of Circles Review

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 circumference.

Front

What is the diameter of a circle?

Back

The diameter is twice the length of the radius and is the distance across the circle through its center.

Front

If the radius of a circle is 8 cm, what is the diameter?

Back

The diameter is 16 cm.

Front

What is the formula for the circumference of a circle?

Back

The circumference (C) is calculated using the formula C = 2πr, where r is the radius.

Front

What does 'circumference' mean?

Back

Circumference is the distance around a circle.

Front

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

Back

The radius is 5 cm (using C = 2πr, r = C/(2π)).

Front

What is π (pi)?

Back

Pi (π) is a mathematical constant approximately equal to 3.14, representing the ratio of the circumference of a circle to its diameter.

Front

How do you find the circumference if you know the diameter?

Back

Use the formula C = πd, where d is the diameter.

Front

What is the relationship between radius and diameter?

Back

The diameter is always twice the radius.

Front

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

Back

The radius is 5 cm.