Question

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

Answer 1

right angle- 90 degrees

total sum of angles in a triangle- 180 degrees

90/2 = 45 degrees

Answer 2

Let ABC be any triangle

In which measure of angleB is equal to the measure of remaining angles that is angleA and angleC

So, in triangle ABC,

angleA + angleC= angleB …………(1)

Now, in triangle

angle A +angle B+ angle C =180°

= angle B + ( angleA + angleB) =180°

= angleB + angleB =180°…………..from(1)

=2 angleB = 180°

= angle B = 180°/2

=angleB= 90°

So, one angle of triangleABC is 90° or if one angle of triangle is 90° this triangle is known as right angled triangle.

So, it is right angled triangle.

//Hope you understood, and sorry if i am wrong...//