Question

an exterior angle of a triangle is of measure 70 degree and one of its interior opposite angle is of measure 25degree .finde the measure of the other interior opposite angle.
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Answer 1

According to the exterior angle theorem.

'The measure of exterior angle is equal to the measure of the sum of remote interior angles.

suppose the angles in the triangle are A B and c.

and the exterior angle is D.

hence,A+B=D

LET A be 25

therefore,

25+B=70

B=70-25

B=45