Question

Which of the following angles cannot be constructed using ruler and compass?

• A. ${15}^{°}$
• B. ${45}^{°}$
• C. ${75}^{°}$
• D. ${85}^{°}$

Answer 1

The correct option is D

${85}^{°}$

Basic Constructions

${85}^{°}$ cannot be constructed using ruler and compass because only the multiples of ${15}^{°}$ can be constructed using ruler and compass.