Side \[QR=10\,\,cm\] and a perpendicular \[AB=10\,\,cm\] as shown above. Find area of parallelogram
A) 100 sq. cm.
B) 50 sq. cm.
C) 75 sq. cm.
D) 25 sq. cm.
Correct Answer: A
Solution :
If you look at the figure with QR as base and AB as height, (by mentally rotating the figure),
Area = base \[\times \] height \[=10\times 10=100\,\,sq.cm.\] Mind of a mathematician: Students should not only multiply numbers but also see how the units are getting multiplied, for e.g. \[acm\times cm=sq.\text{ }cm.\]\[cm\times cm\times cm=c{{m}^{3}}\]. The idea will help you not only in maths but also in physics and chemistry where dimensional accuracy is very important.
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