Question

12. If one angle of a triangle is equal to the sum of the
other two, show that the triangle is a right triangle.
13
no​

Answer 1

Answer:

Hope this would help you

Answer 2

Step-by-step explanation:

let the first angle of the triangle be x

let the second angle of the triangle be y

and the third angle be x+y (because sum of two angle

is equal to the third angle)

then, according to angle sum property of triangle,

x + y + ( x+y) = 180°

2x + 2y = 180°

2 (x + y) = 180° [ taking 2 common]

x + y = 180/2

x + y = 90

Therefore, the third angle which is (x +y) is 90°, the triangle is a right angle triangle.