一道英文数学题a retangle is four times as long as it is wide.if the
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A rectangle is four times as long as it is wide.if the area of the rectangle is 1600cm,waht are its dimensions

一个长方形的长是宽的4倍,长方形的面积是1600cm²,长、宽各为多少?

Solution：

Let x be the width of the rectangle

So,x × 4x = 1600,4x² = 1600,x² = 400,x = square root of 400 = 20 cm.

The length = 20×4 = 80 cm

So,the dimensions are 80cm × 20cm.

平方 = square of .,to the power of 2

开平方 = square root of .,root .

开立方 = cubic root of .

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