Question

A 75${}^{\circ }$ angle can be made by drawing angle bisector between a 90${}^{\circ }$ angle arm and a ___ ${}^{\circ }$arm.

Answer 1

${75}^{\circ }=\frac{{90}^{\circ }+{60}^{\circ }}{2}$
Hence bisecting 90${}^{\circ }$ and 60${}^{\circ }$ will give 75${}^{\circ }$.