Herons Formula ...

Find the area of triangle of sides $$6cm ,8cm ,10cm$$ 

Find the area of a triangle whose sides are respectively $$150\ cm$$, $$120\ cm$$, and $$200\ cm.$$

If every side of a triangle is doubled, the area of the new triangle is $$K$$ times the area of the old one. Find the value of $$K$$.

If the edges of a triangular board are $$15$$ cm, $$36$$cm and $$39$$cm, then the cost of painting its one of the faces at the rate of  $$5$$ paise per cm$$^2$$ is 

In the given figure, the area of the $$\triangle {ABC}$$ is

If the sides of a triangle are $$\dfrac{y}{z} + \dfrac{z}{x},\dfrac{z}{x} + \dfrac{x}{y}$$ and $$\dfrac{x}{y} + \dfrac{y}{z}$$ then its area is 

Three sides of a triangular field are 20m, 21m, and 29m long, respectively. The area of the field is :

The area of a triangle whose sides are 15 m, 16 m and 17 m is :

The sides of a triangle are $$7$$ cm, $$9$$ cm and $$
14$$ cm. Its area is 

The sides of a triangle are in the ratio $$3:5:7.$$ If the perimeter of the triangle is $$60$$ cm, then its area