Question

if one angle of a triangle is equal to the sum of the other two so that the triangle is right angle

Answer 1

let each angle be x y and z

X + y + z = 180

X + ( y + z) = 180.......1

also
X = y + z

substituting the value of y + z in ...1


X + X = 180
2x = 180

X = 90°


so
ΔABC is a right angled triangle




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Answer 2

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