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Divide the triangle in half to get 2 right-angle triangles. Then, cos (base angle).

cos = 1/2 (b/h * 10)

cos = 1/2 (8/10 * 10)

cos = 4/10,

cos = 66.42 degrees, which simplifies to 66 degrees.

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Q: In an isosceles triangle if the base is 8 inches long and the legs are 10 inches long what is the measure of a base angle?
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