Question

if one of the four angles formed by two intersecting lines is right angle , then show that each of the four angles is a right angle .

Answer 1

if one the angle is right angle than by vertical opposite angles are equal we can say opposite angel also 90
the angle of straight lineis 180 degrees
i.e,180 - 90 = 90
by again vertical opposite angle theorem angles are equal
therefore all angles are 90degree
hence proved

Answer 2

Step-by-step explanation:

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