Question

show that if sum of two angle of a triangle is equal to the third angle then the triangle is right angle triangle
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Answer 1

let us assume one angle as' X's

then x+x=90°( to prove it makes a right angle triangle)

2x=90°

x=90÷2

x=45°

since two angles are 45°

their sum = 45+45=90°

Therefore, if the sum of two angles of a triangle is equal to the third angle then the triangle is a right angled triangle.

this is an isosceles right angled triangle, as it has two equal sides and a right angle as well.