What type of special right triangle can an isosceles triangle be?
a.30°-60°-90°
b.45°-45°-90°
c. both a 30°-60°-90° and a 45°-45°-90°
d. none

In an isosceles, two angles have the same measure so it definitely can't be A because none have the same measures. B is right because two angles have a measure of 45 degrees and one has 90.

So B is the correct answer.

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