#isosceles triangle

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spare dune
fair elk
# spare dune

Using the formula for the area of a triangle, 1/2absinC, we can make an equation
42.5 = 1/2(11)²(sinABC)
If we we rearrange this to solve for angle ABC, we get that ABC ≈ ||44.6⁰||
As this is an isosceles triangle, the 2 bases angles are equal so subtract 44.6 from 180 and divide by 2 to get angle ACB