Question

In order to construct a ${90}^{\circ }$ angle, we draw a straight line first. The angle measure of a straight line is ___ (in degrees).

• A. 180°
• B. ${270}^{\circ }$
• C. ${180}^{\circ }$
• D. ${45}^{\circ }$

Answer 1

The correct option is C ${180}^{\circ }$

We first draw a straight line, to bisect it to get ${90}^{\circ }$. The angle that the straight line produces is ${180}^{\circ }$.