The base angle of an isosceles triangle is equivalent to (1/4) of the top angle. How many degrees is the top angle?
等腰三角形一个底角度数相当于顶角的(1/4)，顶角是多少度？
<gadget id="calculator">4 + 1 + 1</gadget>
<output>6</output>

<gadget id="calculator">4 / 6</gadget>
<output>2/3 = around 0.666667</output>

<gadget id="calculator">180 * (2/3)</gadget>
<output>120</output>

<result>120</result>