How would you find two missing angles on an isosceles triangle? Use your knowledge about isosceles triangles - two angles are always the same size. Find out what the total missing value is first: ...

Angles in equilateral triangles The three angles in an equilateral triangle are equal and they add up to 180 ∘. To find the size of each of these angles divide 180 by 3. 180 ÷ 3 = 60 ∘ ...