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Question

A rectangle has the area equal to that of a square of side 80 cm. If the breadth of the rectangle is 20 cm, find its length.


Solution

Side of the square = 80 cm
Area of square = Side × Side = 80 × 80 = 6400 cm2
Given that:
Area of the rectangle = Area of the square = 6400 cm2
Breadth of the rectangle = 20 cm
Applying the formula:
Length of the rectangle = AreaBreadth 
We get:  
Length of the rectangle = 640020 = 320 cm

Mathematics
RD Sharma (2013)
Standard VI

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