Quadrilaterals are the four-sided polygons. By this, it means that the no. of sides, vertices and angles they have is four each. In Quadrilaterals, the internal angles total up to 3600 There are 7 types of different Quadrilateral.

## Quadrilateral Formulas for different quadrilateral types.

 Quadrilateral Type Quadrilateral Formula Square = pÃ—p, p is side. Rectangle Â = lÃ—b Rhombus = $$\begin{array}{l}\frac{d1 \times d2}{2}\end{array}$$, d1 and d2 are diagonals. Parallelogram = bÃ—h Trapezium = $$\begin{array}{l}\frac{[(a+b)h]}{2}\end{array}$$ Isosceles Trapezium = $$\begin{array}{l}\frac{[(a+b)h]}{2}\end{array}$$ Kite $$\begin{array}{l}\frac{d1 \times d2}{2}\end{array}$$, d1 and d2 are diagonals.

### Solved Examples of Formulas of Quadrilateral

Q: The area of a parallelogram is 36 and the height is 6. Find the base.

Sol: Given, area=36, and h=6

To find: base b

Formula: bÃ—h

Area of parallelogram=bÃ—h

36 =b(6)

b=36 / 6 = 6

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