A triangle and a parallelogram have the same area and the same height. If the base of the triangle is 20 meters, how many meters is the base of the parallelogram?
一个三角形与一个平行四边形的面积相等，高也相等，己知三角形的底是20米，那么平行四边形的底是多少米
<gadget id="calculator">1 / 2</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">(1/2) * 20</gadget>
<output>10</output>

<result>10</result>