有一个矩形的green sport field,长为L,宽为W,周围是一圈walking trace,宽为d,其中四个角是矩形的,面积分别为半径为d的圆形的4分之1,求walking trace的面积
条件1:矩形周长是36
条件2:d=20
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If 500 is the mutiple of 100 that is closest to x and 400 is the multiple of 100 that is closest to y,which multiple of 100 is closest to x+y? (1)x小于500 (2)y小于400