Question

which can not be constructed with ruler and a compass
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Answer 1

Answer:

As we can't form angle of 20 ° with help of compass , So we can't form angle of 5 ° , 10 ° , 20 ° , 40 ° , 50 ° , 70 ° , 80 ° , ... with the help of compass . those angles which do not come in the divisibility series of 360/2or3 cannot be made with the help of compass or ruler.

Step-by-step explanation:

I hope my answer helps you.