use 5.12.4;
use Math::Trig;
use strict;
###########################################################################
my $square_side= shift;  ##SQUARE AREA FORMULA
my $square_area= $square_side*2;
###########################################################################
my $rectangle_side=shift;  ##RECTANGLE AREA FORMULA
my $rectangle_side_2=shift;
my $rectangle_area = $rectangle_side*$rectangle_side_2;
###########################################################################
my $paralellogram_base=shift;  ##PARALELLOGRAM AREA FORMULA
my $paralellogram_height= shift;
my $paralellogram_area=$paralellogram_base*$paralellogram_height;
###########################################################################
my $trapezoid_base=shift;  ##TRAPEZOID AREA FORMULA
my $trapezoid_base_2=shift;
my $trapezoid_height=shift;
my $trapezoid_area=$trapezoid_height/2*($trapezoid_base*$trapezoid_base_2);
###########################################################################
my $circle_radius=shift;  ##CIRCLE AREA FORMULA
my $pi=pi;
my $circle_area=$pi*($circle_radius**2);
############################################################################
my $triangle_base=shift; ##NON-EQUALATERAL TRIANGLE FORMULA
my $triangle_height=shift;
my $triangle_area=.5*($triangle_base*$triangle_height);
############################################################################

say "I am an area calculator. I can calculate the area of most basic shapes (mostly).\n";
say "\nWhat type of shape am I working with?\n";

my $type=<>;
chomp ($type);
while ($type){
if ($type eq 'square' or 'Square'){
	say "Okay. I am working with a $type.\n";
	say "ENTER SIDE LENGTH";
	$square_side= <>;
	my $square_area= $square_side*2;
	say "ANSWER=  $square_area";
	last;
}}
while ($type){
if ($type eq 'rectangle' or 'Rectangle'){
	say "Okay. I am working with a $type.\n";
	say "ENTER FIRST SIDE LENGTH";
	$rectangle_side=<>;
	say "ENTER SECOND SIDE LENGTH";
        $rectangle_side_2=<>;
	say "ANSWER=  $rectangle_area";
	last;}}

while ($type){
if ($type eq 'paralellogram' or 'Paralellogram'){
	say "Okay. I am working with a $type.\n";
	say "ENTER BASE";
	$paralellogram_base=shift;
	say "ENTER HEIGHT";
	$paralellogram_height= shift;
        say "ANSWER=  $paralellogram_area";
	last;}}