Ella calculated the missing side length of one of these triangles using the pythagorean theorem. which triangle is it? four triangles are shown. triangle a has sides marked 3 and 5. triangle b has sides marked 4 and 5. triangle c has sides marked 2 and 4 and a right angle marked in between them. triangle d has three equal sides, and two sides are marked 4 and 4. a b c d