Question

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

• A. 30°
• B. 40°
• C. 45°
• D. 60°

Answer 1

The correct option is B 40°

Constructing any angle with compass and ruler can be possible only if it is divisible by 15.
Therefore, among the four given options, 30°, 45°, 60° are multiples of 15 and can be drawn with help of compass and ruler.
40° is the angle which cannot be constructed using compass and ruler.