use 5.14.1;
use Math::Trig;
###########################################################################
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);
if ($type eq 'square' or $type eq '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";
}

elsif ($type eq 'rectangle' or $type eq '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=<>;
	$rectangle_area = $rectangle_side*$rectangle_side_2;
	say "ANSWER=  $rectangle_area";}


elsif ($type eq 'paralellogram' or $type eq 'Paralellogram'){
	say "Okay. I am working with a $type.\n";
	say "ENTER BASE";
	$paralellogram_base=<>;
	say "ENTER HEIGHT";
	$paralellogram_height=<>;
	$paralellogram_area=$paralellogram_base*$paralellogram_height;
        say "ANSWER=  $paralellogram_area";
}

elsif ($type eq 'trapezoid' or $type eq 'Trapezoid'){
	say "Okay. I am working with a $type.\n";
	say "ENTER FIRST BASE";
	$trapezoid_base=<>;
	say "ENTER THE SECOND BASE";
        $trapezoid_base_2=<>;
        say "ENTER HEIGHT";
	$trapezoid_height=<>;
        $trapezoid_area=$trapezoid_height/2*($trapezoid_base*$trapezoid_base_2);
        say "ANSWER=  $trapezoid_area";	}

elsif ($type eq 'circle' or $type eq 'Circle'){
	print "Okay. I am working with a $type. \n";
	say "ENTER RADIUS";
	$circle_radius=<>;
        my $c_answer= ($circle_radius**2)*3.14;
	say "ANSWER=  $c_answer";
}

elsif ($type eq 'triangle' or $type eq 'Triangle'){
	print "Okay. I am working with a $type.\n";
	say "\n ENTER BASE";
	$triangle_base=<>;
	say "ENTER HEIGHT";
        $triangle_height=<>;
        $triangle_area=.5*($triangle_base*$triangle_height);
	say "ANSWER=  $triangle_area";
}else{
	die "I do not have that shape programmed in to my system (yet).Please tell my creator to add the function you have attempted to use.\n\n\n\n";
}