The ratio of the degrees of two acute angles in a right triangle is 1:3, what is the greater of the two acute angles?
一个直角三角形中两个锐角的度数比是1：3，这两个锐角中较大的是多少度．
<gadget id="calculator">1 + 3</gadget>
<output>4</output>

<gadget id="calculator">3 / 4</gadget>
<output>3/4 = around 0.75</output>

<gadget id="calculator">90 * (3/4)</gadget>
<output>135/2 = around 67.5</output>

<result>135/2 = around 67.5</result>