The upper base of a trapezoidal part is 25 cm, the lower base is 40 cm, and the height is 14 cm. How many square centimeters of iron sheets are needed to make 10 such parts?
一个梯形零件的上底是25厘米，下底是40厘米，高是14厘米，做10个这样的零件需要铁皮多少平方厘米．
<gadget id="calculator">25 + 40</gadget>
<output>65</output>

<gadget id="calculator">14 / 2</gadget>
<output>7</output>

<gadget id="calculator">65 * 7 * 10</gadget>
<output>4_550</output>

<result>4_550</result>