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.
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