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= 1/2 (π r²) + (a + b / 2 * t)
= 1/2 (22/7 * 7²) + (14 + 22 / 2 * 15)
= 1/2 (22/7 * 49) + (36 / 2 * 15)
= 1/2 (22 * 7) + (18 * 15)
= 1/2 * 154 + 270
= 77 + 270
= 347 cm²
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