Question

Work out the size of each angle in this triangle. (write answers in ascending order)

Answer 1

First we add all the angles together

x + 2x - 20 + 2x + 10 = 5x - 10

Now, you should know that all the angles in a triangle add up to 180°

180 = 5x - 10

Move the 10 to the other side

190 = 5x

Divide both sides by 5

x = 38

So the angles sizes in ascending order are

38 , 46 , 86