Question

The sum of two angles is equal to the third angle.Determine the third angle.

Answer 1

let the first angle is x
then sum of x + x = 180 (sum of adjacent angle)
then x= 180/2
x =90.
now we know that sum of angle of triangle is 180
then 90+x=180
x=180-90
x = 90

Answer 2

if u r talking about a triangle then,

Angle 1 + Angle 2 = Angle 3 and,

Angle1+Angle2+Angle3= 180(sum of all angles of triangle

So as, Angle 1 + Angle 2 = Angle 3

then, Angle 3= 90

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