Today in maths we had to calculate the missing angles in lots of triangles, there were isosceles, scalene and right angle triangles it the list. Because every angle in a triangle adds up to 180°, so with the isosceles triangles we had to subtract the angle that was shown already from 180 and divide that by two to get the two missing angles. With the scalene triangles, we had two angles already shown and we had to subtract them from 180 and then we got the missing one. For the right angle triangles, we were given one angle but we knew that one of them was 90°, so we subtracted the two angles we knew from 180 and then we got the missing one from them.