Question

Choose the angles which can be constructed with the help of a ruler and compass.

• A. ${30}^{\circ }$
• B. ${110}^{\circ }$
• C. ${90}^{\circ }$
• D. ${120}^{\circ }$

Answer 1

Answer: (A), (C), (D)

The correct options are
A ${30}^{\circ }$
C ${90}^{\circ }$
D ${120}^{\circ }$

Angles which are multiples of ${15}^{\circ }$ can be constructed using compass and ruler.
Since 30, 90 and 120 are multiples of 15, we can draw these using compass and ruler.
${30}^{\circ },{45}^{\circ },{60}^{\circ },{90}^{\circ },{120}^{\circ }$ are some angles which can be drawn with the help of a ruler and compass.