Question

For constructing an angle of 105${}^{\circ }$, you need to construct a 60${}^{\circ }$ angle too.

• A.
• B.

Answer 1

The correct option is A

A 105${}^{\circ }$ angle can be constructed by drawing a bisector between angles 120${}^{\circ }$ and 90${}^{\circ }$ as shown in the figure below. But it can be seen clearly that for constructing angles of 120${}^{\circ }$ and 90 ${}^{\circ }$, one needs to construct 60${}^{\circ }$ first. In the image given, $\angle$DAB will be 60${}^{\circ }$ .