The perimeter of an isosceles triangle is 36 cm, and one side is 1/4 of the other side, what is the length of the base in cm?
一个等腰三角形周长36厘米，其中一条边是另一条边的(1/4)，那么底边长多少厘米．
<gadget id="calculator">1 + 4 + 4</gadget>
<output>9</output>

<gadget id="calculator">1 / 9</gadget>
<output>1/9 = around 0.111111</output>

<gadget id="calculator">36 * (1/9)</gadget>
<output>4</output>

<result>4</result>