$${\mathtt{A}} = {\frac{{\mathtt{g}}{\mathtt{\,\times\,}}{\mathtt{h}}}{{\mathtt{2}}}}$$
http://rechneronline.de/pi/dreieck.php
http://www.mathepower.com/dreieck.php
$${\mathtt{A}} = {\frac{{\mathtt{g}}{\mathtt{\,\times\,}}{\mathtt{h}}}{{\mathtt{2}}}}$$
http://rechneronline.de/pi/dreieck.php
http://www.mathepower.com/dreieck.php