The base of the triangle is 5 decimeters and the height is 4 decimeters. What is the area of a parallelogram with the same base and height
三角形的底是5分米，高是4分米．和它等底等高的平行四边形的面积是多少
<gadget id="calculator">5 * 4</gadget>
<output>20</output>

<result>20</result>