The ratio of the two acute angles of a right triangle is 2:3, what is the smallest angle of this triangle?
一个直角三角形两个锐角度数的比是2：3，这个三角形最小的角是多少度？
<gadget id="calculator">2 + 3</gadget>
<output>5</output>

<gadget id="calculator">2 / 5</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">90 * (2/5)</gadget>
<output>36</output>

<result>36</result>