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. If the missing angle is not opposite a marked side, then add the two angles opposite the marked sides together and subtract this result from 180.If the missing angle is opposite a marked side, then the missing angle is the same as the angle that is opposite the other marked side.To find a missing angle in an isosceles triangle use the following steps: How to Find a Missing Angle in an Isosceles Triangle If we are told that one of these marked angles is 70°, then the other marked angle must also be 70°. The angle at which these two marked sides meet is the odd one out and therefore is different to the other two angles. The two equal angles are opposite to the two equal sides. ![]() The sides that are the same length are each marked with a short line. We can see that in this above isosceles triangle, the two base angles are the same size.Īll isosceles triangles have a line of symmetry in between their two equal sides. It has two equal sides marked with a small blue line. ![]() We can recognise an isosceles triangle because it will have two sides marked with lines.īelow is an example of an isosceles triangle. The two equal sides are marked with lines and the two equal angles are opposite these sides. ![]() An isosceles triangle is a triangle that has two equal sides and two equal angles.
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