2)define area and mvoluate the interface which has methods area(),volume().define consatnt Pi create new classs cyliender which implemnets ths interface and calculate area and define.
<?php
define("PI",3.14);
$r;
$h;
$aoc;
interface i1
{
public function area($x,$y);
public function volume($x,$y);
}
class cylinder implements i1
{
public function area ($x,$y)
{
$GLOBALS['r']=$x;
$GLOBALS['h']=$y;
$GLOBALS['aoc']=2*PI*$GLOBALS['r']*$GLOBALS['h'];
echo $GLOBALS['aoc'];
}
public function volume($x,$y)
{
$GLOBALS['r']=$x;
$GLOBALS['h']=$y;
$GLOBALS['aoc']=PI*($GLOBALS['r']*$GLOBALS['r'])*$GLOBALS['h'];
echo "
" .$GLOBALS['aoc'];
}
}
$obj=new cylinder();
$obj->area(2,3);
$obj->volume(2,3);
?>
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