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Question

In a parallelogram the angle bisectors of two adjacent angles intersect at angles.

A
acute
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B
obtuse
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C
right
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Solution

The correct option is C right
Let ABCD be a parallelogram.
Consider two adjacent angles A and B
A+B=1800
[Adjacent angles of parallelogram are supplementary]
A2+B2=18002
[Angular bisectors of A and B]
A2+B2=900
If these two angle bisectors meet, it forms a triangle and the sum of the measures of the angles,formed by the angle bisectors and commmon arm, is 900.
The third angle where these angle bisectors meet will be 900
[Since sum of all the angles of a triangle is 1800]

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