write the java code to implement it$.$

we need a program that will calculate the area of three shapes: Rectangle, Tringle and Circle. Knowing that:

$,$ Rectangle area $=$ first $**$ second

$,$ Tringle area $=$ first $\frac{?}{2}**$ second

Circle area $=**($first$*$first$)$

$1-$ Define these variables:

First $=5,$ second $=3\mathrm{.}5,=3\mathrm{.}14$

$2-$ Print the area of each shape in a separate line use format specifiers to display only $2$ decimal integers of the result.