Question

In the quadrilateral abcd ,ao and bo are bisectors of angle a and angle

b.prove that angle aob = 1/2 (angle c +angle d)

Answer 1

We know angle A+angle B +angle C+ angle D =360 (1) In triangle ABO angle AOB+ 1/2( angle A+angle B)=180 2(AOB+ 1/2(angle A+ angle B)=360 (2) We have angle 2 AOB + ...