Question

Which of the following angles cannot be obtained from 180 degrees?

• A. ${22.5}^{\circ }$
• B. ${25}^{\circ }$
• C. ${45}^{\circ }$
• D. ${90}^{\circ }$

Answer 1

The correct option is B ${25}^{\circ }$

$\frac{180}{2}={90}^{\circ }$
So, ${90}^{\circ }$ can be obtained by bisecting ${180}^{\circ }.$

$\frac{90}{2}={45}^{\circ }$
So, ${45}^{\circ }$ can be obtained by bisecting ${90}^{\circ }.$

$\frac{45}{2}={22.5}^{\circ }$
So, ${22.5}^{\circ }$ can be obtained by bisecting ${90}^{\circ }.$

Therefore, ${25}^{\circ }$ cannot be obtained by bisecting ${180}^{\circ }$