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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