`PQRS` is a parallelogram `(Fig 11.23). QM` is the height from `Q` to `SR and QN` is the height from `Q` to `PS.` If `SR=12cm and QM=8cm.` Find : `(a) the area of the parallegram `PQRS` (b) `QN,` if `PS=8cm`

Explanation

To solve the problem step by step, we will find the area of the parallelogram PQRS and then calculate the height QN.

### Step 1: Find the Area of Parallelogram PQRS
The area \( A \) of a parallelogram can be calculated using the formula:
\[ A = \text{base} \times \text{height} \]
In this case, we will take \( SR \) as the base and \( QM \) as the height.
...