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$a = 5; // length of two equal sides $base = 8; $area = (1 / 2.0) * $base * sqrt(($a * $a) - (($base * $base) / 4)); echo "Area of Isosceles Triangle = " . $area; /* run: Area of Isosceles Triangle = 12 */
$h = 3; $base = 8; $area = (1 / 2.0) * $base * $h; echo "Area of Isosceles Triangle = " . $area; /* run: Area of Isosceles Triangle = 12 */