Find the length of the radius of the circle if the length of the diameter is 1) 80mm 2) 35mm 3) 2 cm 4) 8.4 cm

A circle is a closed curve that consists of all points equidistant from the center.

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

A diameter is a segment connecting two points of a circle that passes through its center. It is equal to two radii:

D = 2R;

R = D / 2.

1) R = 80 mm / 2 = 40 mm;

2) R = 35 mm / 2 = 17.5 mm;

3) R = 2 cm / 2 = 1 cm;

4) R = 8.4 cm / 2 = 4.2 cm.

Answer: with a diameter of 80 mm, the radius is 40 mm, with a diameter of 35 mm – a radius of 17.5 mm, with a diameter of 2 cm – a radius of 1 cm, with a diameter of 8.4 cm – a radius of 4.2 cm.