How to Find Missing Angles in an Isosceles Triangle from only One Angle We can also think, “What angle do we need to add to 70° and 70° to make 180°?” The missing angle on the top of this isosceles triangle is 40°. We subtract the 140° from 180° to see what the size of the remaining angle is. The missing angle is not opposite the two marked sides and so, we add the two base angles together and then subtract this result from 180 to get our answer.Īngles in an isosceles triangle add to 180°. The two base angles are opposite the marked lines and so, they are equal to each other. This is because all three angles in an isosceles triangle must add to 180°įor example, in the isosceles triangle below, we need to find the missing angle at the top of the triangle.
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