If the base of a triangle is 30 cm and the height is 15 cm, what is the area of a parallelogram with the same base and height as the triangle?
一个三角形的底是30厘米，高是15厘米，那么和这个三角形等底等高的平行四边形的面积是多少平方米．
<gadget id="calculator">15 / 10_000</gadget>
<output>3/2_000 = around 0.0015</output>

<gadget id="calculator">30 * (3/2_000)</gadget>
<output>9/200 = around 0.045</output>

<result>9/200 = around 0.045</result>