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Answer:
angle 1 = angel 2 ( GP is bisector)
also by same logic
angle 3 = angle 4
now angle BGH + angle OHG = 180 ( co interior angle)
angle( 1+2+3+4) =180
2angle (1+3) =180 { angle 1= angle2 & angle 3 = angle 4)
angle 1 + angle 3 =90
Now in ∆GPH
angle 1 + angle 3 + angle GPH = 180 ( 1)
90 + angle GPH = 180
angle GPH= 90
Now if you want to prove angle sum property of ∆
then we can say from equation 1
Hope it helps