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CBSE Class 9 Answered

Which of the following angles is possible to construct with the help of a ruler and a pair of compasses?  Option A :42.5°   Option B :40°  Option C :67.5°  Option D :55°
Asked by gujarsurjeet007 | 14 Feb, 2018, 10:47: AM
answered-by-expert Expert Answer
you have to make angle of 60 first
now using angle bisectors you can construct angles 
so angles which are multiple of 15 can be constructed
so 15,30,45,60,.....
also half of above angles can be also constucted by bisecting angles
so 67.5 double is 135 which is multiple of 15 can be constructed

Answered by Arun | 14 Feb, 2018, 12:08: PM

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