If the ratio of the two interior angles of an isosceles triangle is 2:1, what is the maximum angle of the apex of this isosceles triangle?
一个等腰三角形的两个内角度数比是2：1，则这个等腰三角形的顶角最大是多少度．
<gadget id="calculator">2 + 1 + 1</gadget>
<output>4</output>

<gadget id="calculator">2 / 4</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">(1/2) * 180</gadget>
<output>90</output>

<result>90</result>