The ratio of the base to the height of an isosceles triangle is 4:3. Cut it along the corresponding height of the base to form a rectangle. The perimeter of this rectangle is 60 cm. What is the area of the rectangle in square centimeters?
一个等腰三角形底和高的比是4：3，把它沿底边上对应的高剪开，拼成一个长方形，这个长方形周长是60厘米，长方形的面积是多少平方厘米．
<gadget id="calculator">60 / 2</gadget>
<output>30</output>

<gadget id="calculator">2 + 3</gadget>
<output>5</output>

<gadget id="calculator">3 / 5</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">30 * (3/5)</gadget>
<output>18</output>

<gadget id="calculator">2 / 5</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">30 * (2/5)</gadget>
<output>12</output>

<gadget id="calculator">18 * 12</gadget>
<output>216</output>

<result>216</result>