(REVIEW) Circles (radius, diameter, center)

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.

Front

What is the diameter of a circle?

Back

The diameter is a straight line that passes through the center of the circle and connects two points on its edge. It is twice the length of the radius.

Front

If the radius of a circle is 3 m, what is the diameter?

Back

The diameter is 6 m (diameter = 2 x radius).

Front

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

Back

The radius is 5 cm (radius = diameter / 2).

Front

What is the center of a circle?

Back

The center is the point that is equidistant from all points on the circle's edge.

Front

How do you find the circumference of a circle?

Back

Circumference = 2 x π x radius.

Front

What is the formula for the area of a circle?

Back

Area = π x radius².

Front

If a circle has a radius of 4 cm, what is its area?

Back

The area is 50.27 cm² (Area = π x 4²).

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 area?

Back

The area increases by a factor of four.