Question

Which among the following angles cannot be constructed just by using a ruler and a compass?

• A. 30 degrees
• B. 60 degrees
• C. 70 degrees
• D. 90 degrees

Answer 1

The correct option is C

70 degrees

All the standard angles and the angles which can be obtained by bisecting standard angles can be constructed just by using a ruler and compass. Here except ${70}^{\circ }$ all other angles can be constructed using ruler and compass.