If the base of a triangle is 15 cm and the height is 7 cm, what is its area in square centimeters?
一个三角形的底是15厘米，高是7厘米，它的面积是多少平方厘米．
<gadget id="calculator">7 / 2</gadget>
<output>7/2 = around 3.5</output>

<gadget id="calculator">15 * (7/2)</gadget>
<output>105/2 = around 52.5</output>

<result>105/2 = around 52.5</result>