Question

If one acute angle of a set square is ${60}^{\circ }$, then the other acute angle is

• A. ${45}^{\circ }$
• B. ${60}^{\circ }$
• C. ${30}^{\circ }$

Answer 1

The correct option is C ${30}^{\circ }$

A set square is a right angled triangle. We know the acute angles of a right a right angle triangle are complementary (add upto 90${}^{\circ }$).
If one acute angle is ${60}^{\circ }$, then the other acute angle is ${90}^{\circ }-{60}^{\circ }={30}^{\circ }$