Given that the area of trapezoid is 54 square centimeter, calculate the area of shadow part

(1) The height of trapezoid is 54 × 2 ^ (10 + 8) = 6 (CM), that is, the radius of great circle is 6 cm; (2) shadow area: 14 × 3.14 × 62-3.14 × (6 ^) 2 ^ (2), = 28.26-14.13, = 14.13 (cm2); answer: shadow area: 14.13 cm2

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