Question

The angles of a triangle are (x - 5), (x + 15)°

and (2x + 10). Given that the sum of the
angles of a triangle is 180°, calculate the size
of each angle.​

Answer 1

35°, 55°, 90°

Explanation:

Since all the angles of a triangle equal 180, add them all together and set them equal to 180.

(x-5)+(x+15)+(2x+10)=180

Now solve for each angle.

(40-5)

=35°

(40+15)

=55°

(2(40)+10)

=90°

Now check your work.

35°+55°+90°

=180°