Question

In a triangle,the first angle measures 15 degrees which is 20 degrees less than the second angle

Answer 1

First angle=15°

Second angle=15°+20°

=35°

Third angle=?

Let third angle=x

Sum of three angles of triangle=180°

15°+35°+x=180°

15°+x=180°-35°

15°+x=145°

x=145°-15°

x=130°

Therefore, the third angle is 130°