Area is calculated by the formula Area =r2. Given the value of r=5 and =3.142, write a PHP code to set up the formula in PHP and to echo the value of area. // declare pi //declare r //declare area //echo area Area is calculated by the formula Area =r2. Given the value of r=5 and =3.142, write a PHP code to set up the formula in PHP and to echo the value of area. // declare pi //declare r //declare area //echo area Area is calculated by the formula Area =r2. Given the value of r=5 and =3.142, write a PHP code to set up the formula in PHP and to echo the value of area. //declare pi // declare r //declare area //echo area Area is calculated by the formula Area =r2. Given the value of r=5 and =3.142, write a PHP code to set up the formula in PHP and to echo the value of area. //declare pi // declare r // declare area //echo area