ABC is a triangle in which angle A is equal to 72 degree the internal bisectors of Angle B and C meet in a find the magnitude of angle BOC
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Answer:
1) < BAC = 72. ... ( Given )
2 ) < BAC + < ABC + < ACB = 180. ... ( angle sum property of triangles
3 )》72 + < ABC + < ACB = 180
》< ABC + < ACB = 180 - 72
》< ABC + < ACB = 108
4 )Dividing both the sides by 1/2 we get ,
》< ABC/2 + < ACB/2 = 108/2
But < ABC/2 = < OBC & < ACB/2 = < OCB
5) Hence
< OBC + < OCB = 54
6)If we consider Triangle BOC
< OBC + < OCB + < BOC = 180. ... ( Angle sum property of triangles )
7) But < OBC + < OCB = 54. .. ( from 5 )
》54 + < BOC = 180
》< BOC = 180 - 54
》< BOC = 126
Hope it helps you ..!!
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