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AB = 25

Step-by-step explanation:

First things first, we know that these triangles are similar. Now let's find BC using the Pythagorean Theorem. BC = , this side is similar to the 5 side of the smaller triangle. That means each side of the larger triangle times larger than the corresponding side on the small triangle. That means AB is times larger than BC as well. So multiply BC by get us the answer.

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step-by-step explanation: