height of the triangle = 9
radius = 5
so from center of top of triangle = 5
therefore bottom of triangle = 4
the center to the bottom right point of the triangle = 5
the triangle made by the point o the center to the bottom of the triangle is a 3, 4 ,5 triangle.
therefore half the base is 3 so the base = 6
6x9 = 54
54/2 = 27
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