![]() ![]() This time, we know the angle that is not opposite a marked side. Here is another example of finding the missing angles in isosceles triangles when one angle is known. We first add the two 50° angles together.Īngle ‘b’ is 80° because all angles in a triangle add up to 180°. To find angle ‘b’, we subtract both 50° angles from 180°. Now to find angle ‘b’, we use the fact that all three angles add up to 180°. This means that it is the same size as the angle that is opposite the other marked side. This angle is opposite one of the marked sides. Here is an example of finding two missing angles in an isosceles triangle from just one known angle. If the known angle is not opposite a marked side, then subtract this angle from 180° and divide the result by two to get the size of both missing angles.Add these two angles together and subtract the answer from 180° to find the remaining third angle. If the known angle is opposite a marked side, then the angle opposite the other marked side is the same.If only one angle is known in an isosceles triangle, then we can find the other two missing angles using the following steps: ![]() 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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