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一道英文数学题a retangle is four times as long as it is wide.if the

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