If the base of a triangle is 6 decimeters and the height is 30 centimeters, what is the area of a parallelogram with the same base and height?
一个三角形的底是6分米，高是30厘米，与它等底等高平行四边形的面积是多少．
<gadget id="calculator">6 * 10</gadget>
<output>60</output>

<gadget id="calculator">30 / 2</gadget>
<output>15</output>

<gadget id="calculator">60 * 15 * 2</gadget>
<output>1_800</output>

<result>1_800</result>