Question

A circle is divided into 80 equal parts, then the angle between any two alternate radii is______ degrees.

• A. 9

Answer 1

The correct option is A 9
If a circle is divided into 80 equal parts, then the angle between two adjacent radii is $\frac{{360}^{\circ }}{80}$ i.e 4.5 degrees.
The angle between two alternate radii is $2\times 4.5$ i.e 9 degrees.