A rectangle is 14 cm long and 10 cm wide . If the length is reduced by x cms and its width is increased also by x cms so as to make it a square, then its area changes by :
4
144
12
2
None of these
Description (বিবরণ) :
প্রশ্ন: A rectangle is 14 cm long and 10 cm wide . If the length is reduced by x cms and its width is increased also by x cms so as to make it a square, then its area changes by :
ব্যাখ্যা:
Area = 14 × 10 = 140 sq.cm
New length = ( 14 - x)
New width = ( 10 + x)
14 - x = 10 + x
2x = 4
x = 2
New Area = ( 14 - 2) × ( 10 + 2) = 144
change is area = ( 144 - 140) sq.cm = 4 sq.cm
Related Question
If the length of a rectangle is increased by 20% and the width is decreased by 20%, the area is :
increases by 10%
Stay the same
decreased by 4%
decreased by 20%
