In a right triangle, one acute angle is three times the other acute angle, what is the other acute angle in degrees?
在直角三角形中，一个锐角是另一个锐角的3倍，另一个锐角是多少°．
<gadget id="calculator">3 / 1</gadget>
<output>3</output>

<gadget id="calculator">3 + 1</gadget>
<output>4</output>

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

<gadget id="calculator">90 * (1/4)</gadget>
<output>45/2 = around 22.5</output>

<result>45/2 = around 22.5</result>