In an isosceles triangle, the ratio of the apex angle to the base angle is 2:3, what is the apex angle?
一个等腰三角形，顶角与一个底角的度数比是2：3，顶角是多少度．
<gadget id="calculator">2 + 3 + 3</gadget>
<output>8</output>

<gadget id="calculator">2 / 8</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">180 * (1/4)</gadget>
<output>45</output>

<result>45</result>