1.

Given an isosceles triangle with equal sides of length b, base angle α<π4 and R,r are the radii of circumcircle and incircle and O,I are the centres of circumcircle and incircle respectively. Then:

Answer»

Given an isosceles triangle with equal sides of length b, base angle α<π4 and R,r are the radii of circumcircle and incircle and O,I are the centres of circumcircle and incircle respectively. Then:



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