Finding Area Using Function Php

What is Area in Mathematical ?

Area is the size and amount of two-dimensional space taken up by an object.Like  Square , Equilateral Triangle , Circle , Rectangle, Parallelogram , Triangle , Ellipse and Trapezoid.

Function

/*Same Size Sides*/
function square($var) {
	return $var * $var;
}
function equilateral_triangle($side) {
	return 0.43301 * ($side * $side);
}
/*Two Different Size Sides*/
function rectangle($vala, $valb) {
	return $vala * $valb;
}
function parallelogram($base, $height) {
	return $base * $height;
}
function triangle($base, $height) {
	return 0.5 * $base * $height;
}
/*One Radius*/
function circle($radius) { 
return 3.14 * ($radius * $radius); 
}
/*Two Different Radius*/
function ellipse($radius1, $radius2) {
	return 3.14 * $radius1 * $radius2;
}
/*Two Different Base*/
function trapezoid($height, $base1, $base2) {
	return (($base1 + $base2) / 2) * $height;
}

echo square(4); // 16
echo equilateral_triangle(4); // 6.92816
echo circle(15); // 706.5
echo rectangle(15,15); // 225
echo parallelogram(15,5); // 75
echo triangle(15,5); // 37.5
echo ellipse(15,5); // 235.5
echo trapezoid(10,10,10); // 100

Demo