Ross calculated the missing side length of one of these triangles using the pythagorean theorem. which triangle was it?

four triangles e, f, g, h are shown from left to right. triangle e has two sides labeled 2 each, and the included acute angle is shown. triangle f has one side labeled as 2 and the other as 3, and the included right angle is shown. triangle g has one side labeled as 4 and the other as 2, and the included obtuse angle is shown. triangle h has one side labeled as 6 and the other as 7, and the included acute angle is shown.
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