Write a Fortran program to calculate the area of a triangle with $3$ sides. To do this, your program should consist

of following major steps:

$1-$ ask the user to the sides of a triangle via keyboard entry,

$2-$ Check whether the entered sides can make a triangle. If the entered sides cannot make a triangle, an error

message should be printed on the screen. To form a triangle, each side must be shorter than the sum of the other

two sides.

$3-$ calculates the area of the triangle based on this formulation,

$4-$ prints the area of the triangle on the screen.

Sample Run $1$:

This program calculates the area of a triangle with $3$ sides.

Enter the length of the first side in meters.

$8\mathrm{.}8$

Enter the length of the second side in meters.

$3\mathrm{.}7$

Enter the length of the third side in meters.

$4\mathrm{.}0$

The entered sides cannot make a triangle.

Sample Run $2$:

This program calculates the area of a triangle with $3$ sides.

Enter the length of the first side in meters.

$3$

Enter the length of the second side in meters.

$7$

Enter the length of the third side in meters.

$6$

The area of the entered triangle is $8\mathrm{.}94427204$ squared meters.