Question

if one angle of a triangle equal to sum the of the other two angle what

Answer 1

Here is ur answer!!!!
Let ABC be a triangle,

angleA+ angleB= angleC (1)

angleA+angleB+angleC=180 degrees .... -Angle sum property of triangles

angleC+angleC=180 ............... - From eqn. (1)

2*angleC=180

angleC=90

therefore triangleABC is a right angled triangle, right angled at C.

Answer 2

as the greatest angle in a triangle is 90 degrees so the other 2 angles should be less than 90. let us take one angle as x and another one as y.
(x+y) + 90 = 180 (angle sum property of a triangle)
(x+y)=180 - 90
(x+y)=90 (in a right-angled triangle the greatest angle is 90 so the sum of other two angles will be equal to 90