数学嘎嘎嘎嘎哈哈哈哈好尴尬vddgh

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数学嘎嘎嘎嘎哈哈哈哈好尴尬vddgh
数学嘎嘎嘎嘎哈哈哈哈好尴尬vddgh
 

数学嘎嘎嘎嘎哈哈哈哈好尴尬vddgh
设大圆半径为R,小圆半径为r,各图形的面积用对应的S表示
S梯形ACDB= S三角形AOB - S三角形COD=R²/2-r²/2=25 所以R²-r²=50
S圆环=S大圆-S小圆=3.14R²-3.14r²=3.14*（R²-r²）=3.14*50=157平方厘米

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