In a right triangle, one acute angle is known to be twice the other acute angle, find the measure of the largest acute angle.
在直角三角形中，已知一个锐角是另一个锐角的2倍，求其中最大的锐角的度数．
<gadget id="calculator">1 + 2</gadget>
<output>3</output>

<gadget id="calculator">90 / 3</gadget>
<output>30</output>

<gadget id="calculator">2 * 30</gadget>
<output>60</output>

<result>60</result>