The ratio of the two acute angles of a right triangle is 2:1, what is the largest acute angle?
一个直角三角形两个锐角之比是2：1，其中最大的锐角是多少．
<gadget id="calculator">2 + 1</gadget>
<output>3</output>

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

<gadget id="calculator">90 * (2/3)</gadget>
<output>60</output>

<result>60</result>