the width of a rectangle is 7 cm shorter than the length .if the perimeter of the rectangle is 38 cm ,find(a) the width(b) the length(c) the area of the rectangle
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the width of a rectangle is 7 cm shorter than the length .if the perimeter of the rectangle is 38 cm ,find(a) the width(b) the length(c) the area of the rectangle
the width of a rectangle is 7 cm shorter than the length .if the perimeter of the rectangle is 38 cm ,find
(a) the width
(b) the length
(c) the area of the rectangle
the width of a rectangle is 7 cm shorter than the length .if the perimeter of the rectangle is 38 cm ,find(a) the width(b) the length(c) the area of the rectangle
题意:一个矩形的宽度比长度短了7厘米.如果矩形的周长是38厘米,得到
(a)宽度
(b)长度
(c)矩形区域
设length长=x,则width宽=x-7
perimeter周长=2(x+x-7)=38.
解之,得x=13
the width宽=the length长-7=13-7=6
(b) 由(a)知the length长=13
(c)the area of the rectangle 面积=the width长×the length宽=13×6=78
这个题的意思是
一个矩形的宽度比长度短了7厘米。如果矩形的周长是38厘米,得到:
a 宽度:6
(b)长度13
(c)矩形区域
78
设ength=x,则width=x-7,所以perimeter=2(x+x-7)=38.得x=13
the width=6
the length=13
the area of the rectangle=78