Chp 8.1 - Radius and Diameter

Front

What is the diameter of a circle?

Back

The diameter is the distance across a circle through its center, equal to twice the radius.

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

If the radius of a circle is 4 mm, what is the diameter?

Back

The diameter is 8 mm (diameter = 2 x radius).

Front

If the diameter of a circle is 16 cm, what is the radius?

Back

The radius is 8 cm (radius = diameter / 2).

Front

What is the relationship between radius and diameter?

Back

The diameter is always twice the length of the radius.

Front

If a circle has a radius of 7 mm, what is the diameter?

Back

The diameter is 14 mm.

Front

Is the red line a radius or diameter of the circle?

Back

If it connects the center to the edge, it is a radius; if it connects two points on the edge through the center, it is a diameter.

Front

What is the formula to calculate the diameter from the radius?

Back

Diameter = 2 x Radius.

Front

What is the formula to calculate the radius from the diameter?

Back

Radius = Diameter / 2.

Front

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

Back

The radius is 5 cm.