Tinh dien tich

by phuocmien Thu Jul 30, 2015 7:45 am

Code:: <form action="" method="post" name="f2" onsubmit="return kt();"> Bien 1: <input type="text" name="txtb1" value="<?php echo @$_REQUEST['txtb1'];?>"/><br /> Bien 2: <input type="text" name="txtb2" value="<?php echo @$_REQUEST['txtb2'];?>" /><br /> <input type="radio" name="rdchon" value="ht" checked/>Hinh tron <input type="radio" name="rdchon" value="tg" <?php if(@$_REQUEST['rdchon']=='tg'){echo 'checked';}?>/>Tam giac <input type="radio" name="rdchon" value="cn" <?php if(@$_REQUEST['rdchon']=='cn'){echo 'checked';}?>/>Chu nhat<br /> <input type="submit" value="Tính" name="sbtinh" /> </form> <?php if(isset($_REQUEST['sbtinh'])){ $b1=$_REQUEST['txtb1']; $b2=$_REQUEST['txtb2']; $dt=0; $hinh=""; if($_REQUEST['rdchon']=="ht"){ $dt=3.14*$b1*$b1; $hinh="tron"; } if($_REQUEST['rdchon']=="tg"){ $dt=(1/2)*$b1*$b2; $hinh="tam giac"; } if($_REQUEST['rdchon']=="cn"){ $dt=$b1*$b2; $hinh="chu nhat"; } echo "Dien tich hinh ".$hinh ." la $dt"; } ?>