Question

An exterior angle of a triangle is if measure 70 degrees and one of its interior opposite angles is of measure 25 degree. find the measurements of the supplement of the other interior opposite angle .​

Answer 1

Given :- In a ∆,

Exterior angle = 70°

One co-interior angle = 25°

Now As we know that the sum of two co-interior angles of a triangle is always equal to the one exterior angle.

Let the other angle = x

=> x + 25° = 75°

=> x = 50°

Therefore,

first angle = 25°

Second angle = 50°

&

Third angle = 105°