Question

In a triangle sum of two angle are equal to other angle.then show that it is a right angled triangle.​

Answer 1

Step-by-step explanation:

let the angles be a,b,c

c=a+b

we know that sum of angles of a triangle=180

a+b+c=180

c+c=180

c=90

if one angle is 90, the it's a right angled triangle.

hence proved!