The three sides of a right triangle are 3 decimeters, 4 decimeters and 5 decimeters. What is its area in square feet.
一个直角三角形的三条边分别为3分米、4分米和5分米．它的面积是多少平方分米．
<gadget id="calculator">4 / 2</gadget>
<output>2</output>

<gadget id="calculator">3 * 2</gadget>
<output>6</output>

<result>6</result>