Which of the angles cannot be constructed with a pair of compass and ruler only.
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Dear friend your qustion is incomplete as you have not given the option of any angel but as your help i am giving you a rough example realated to this question
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°
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
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