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Class 7 - (Math )
Mensuration - Perimeter- Triangle, Quadrilateral Polygon
The length of a rectangular hall is twice its width. What is the perimeter of the hall if the area is 800 m²?
a :
120 m
b :
80 m
c :
100 m
d :
160 m
Explanation :
L=2B -> 2B × B = 800 -> B² = 400 -> B = 20, L = 40.
Perimeter = 2(40+20) = 120 m.
Perimeter = 2(40+20) = 120 m.