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作圖可知,所圍的圖形為一個大扇形+一個等腰直角三角形-小扇形小扇形圓心角=45°,半徑=√2,大扇形圓心角=90°,半徑=2等腰直角三角形邊長=大扇形半徑=2所以,所圍圖形面積=π×(2²;)×(90/360)-π×(√2)…
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