Answer:
Option C
Step-by-step explanation:
if you cut this isosceles triangle down the dotted line it turns into 2 right triangles. From there you can use the pythagorean equation to solve for x. because the triangle has been cut in half, the 12 on the base turns into 6 for each right triangle. so once again, using the pythagorean equation 8^2 + 6^2 = 100, then √100 = 10
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