Herons Formula ...

Calculate the area of quadrilateral $$ABCD$$.

The parallel sides of a parallelogram are $$40$$ and $$15$$ m and one of the diagonals is $$35$$ m. Find the area of the parallelogram, if the distance between the parallel sides is $$50$$ m. (Use Heron's formula)

The parallel sides of a parallelogram are $$20$$ and $$10$$ m and one of the diagonals is $$12$$ m. Find the area of the parallelogram. (Use Heron's formula)

The sides of a triangle are $$5\ cm, 12\ cm$$ and $$13\ cm$$, what is its area?

A triangle and a parallelogram have the same base and the same area. If the sides of the triangle are $$15 cm, 14 cm, 13 cm$$, and the parallelogram stands on the base of $$15$$ cm. Find the height of the parallelogram.

What is the area of a triangle whose sides are $$13\ cm, 14\ cm$$ and $$15\ cm$$?

Find the number of trees that can be planted in a triangular ground having sides $$51m, 37m$$ and $$20m$$, when each tree occupies $$6m^2$$ of space:

In $$\triangle ABC, AB = 6\ cm, BC = 7\ cm$$ and $$AC = 5\ cm$$. Find the area of $$\triangle ABC$$

Find the area of the parallelogram with sides $$11 cm$$ and $$13 cm$$ and one of the diagonals as $$16 cm. $$

Find the area of the quadrilateral whose sides are $$9 m ,40 m, 28 m, 15 m$$. The angle between first two sides is $$90^o$$.