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Catya
It's a half circle plus a triangle.
The diameter of the circle is 23.1 ft so the radius is 11.55

Area of a circle is πr²
Area of a triangle is (1/2)bh

Area shape = (1/2)πr² (1/2)bh
A = (1/2)π(11.55)² + (1/2)(23.1)(29.4)
A = 549.1181

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