Herons Formula ...

If the sides of triangle are 4, 5 and 6 cm. Then the area (in sq cm) of triangle is 

Find the area of equilateral triangle each of whose sides measures 20 cm.

Find the area of equilateral triangle (in $${cm^2}$$)each of whose sides measure 18 cm.

The area of an equilateral triangle is $$4 \sqrt{3} \,cm^2.$$ The length of each of its sides is

The sides of a triangle measures $$13\,cm , 14\,cm$$ and $$15\,cm.$$ Its area is

Each side of an equilateral triangle is $$8 \,cm$$ long. Its area is:

Find the area of $$\triangle ABD$$

In an isosceles triangle $$PQR$$, the altitude $$ PS = 6 $$ $$cm$$ and $$PQ = PR = 10$$ $$cm$$. Find the area of $$\triangle PSR$$.

If $$AD = 4$$ $$cm$$ and $$AB = 5$$ $$cm$$ in the given figure, then find the area of $$\triangle ADB$$.

In the given figure, if $$PL = 2 QL$$, then what will be the area of $$\triangle PLQ $$?