Q.  5.    PQRS is a parallelogram (Fig 11.23). QM is the height from Q to SR and QN is the height from Q to PS. IfSR=12 \; cm and

             QM=7.6 \; cm. Find:

            

                (b) QN, if PS=8\; cm.

Answers (1)
R Riya

We know that

Area of parallelogram  = base \times height

Here, 

Base of parallelogram = 12 cm

and

Height of parallelogram = 7.6 cm

\Rightarrow 12 \times 7.6 = 91.2 \ cm^2

Now,

Area is also given by QN \times PS

\Rightarrow 91.2 = QN \times 8

\Rightarrow QN = \frac{91.2}{8} = 11.4 \ cm

Therefore, value of QN is  11.4 \ cm

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