Find the area of an isosceles triangle whose base is $10 \mathrm{cm}$ and one of its equal sides is $13 \mathrm{cm}$.

Perimeter of an isosceles triangle is $40 \mathrm{cm}$ and each of the equal sides is $15 \mathrm{cm}$. Find the area of the triangle using Heron's formula.

A signboard is in the shape of an equilateral triangle with side 'a'. Find the area of the signboard using Heron's formula. If the perimeter of the board is $210 \mathrm{cm}$, what will be its area ?

The sides of a triangular field are $975 \mathrm{m}$, $1050 \mathrm{m}$ and $1125 \mathrm{m}$. If this field is sold at the rate of  $₹10 \mathrm{per} {\mathrm{m}}^2$, find its selling price.

Find the area of an isosceles triangle whose base is $6 \mathrm{cm}$ and perimeter is $16 \mathrm{cm}$.

Find the area of the quadrilateral $\mathrm{ABCD}$ in which $\mathrm{AB}=5 \mathrm{cm}, \mathrm{BC}=4.5 \mathrm{cm}, \mathrm{CD}=3.5 \mathrm{cm}, \mathrm{DA}=4 \mathrm{cm}$ and $\mathrm{AC}=6.5 \mathrm{cm}$

Find the area of the quadrilateral $\mathrm{ABCD}$ in which $\mathrm{AB}=3 \mathrm{cm}, \mathrm{BC}=5 \mathrm{cm}, \mathrm{CD}=6 \mathrm{cm}, \mathrm{DA}=6 \mathrm{cm}$ and $\mathrm{BD}=5 \mathrm{cm}$

Find the area of the quadrilateral $\mathrm{ABCD}$ in which $\mathrm{AB}=3.5 \mathrm{cm}, \mathrm{BC}=4.5 \mathrm{cm}, \mathrm{CD}=6 \mathrm{cm}, \mathrm{DA}=3 \mathrm{cm}$ and $\mathrm{BD}=5.5 \mathrm{cm}$

Find the area of the quadrilateral $\mathrm{ABCD}$ in which $\mathrm{AB}=6 \mathrm{cm}, \mathrm{BC}=4 \mathrm{cm}, \mathrm{CD}=4 \mathrm{cm}, \mathrm{DA}=5 \mathrm{cm}$ and $\mathrm{AC}=6 \mathrm{cm}$