Quadrilaterals

- Diagonal of a parallelogram divides it into two congruent triangles.

In the given figure, if ABCD is a parallelogram and AC is its diagonal then ΔABC ΔCDA.

**Example:**

The area of the parallelogram PQRS is 120 cm^{2}. Find the distance between the parallel sides PQ and SR, if the length of the side PQ is 10 cm.

**Solution:**

Let us draw a diagonal SQ of parallelogram PQRS and a perpendicular SX on the extended line PQ as s…

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