In a right triangle, the ratio of the two acute angles is 5:4, what is the greater acute angle?
一个直角三角形中，两锐角度数的比是5：4，其中较大锐角是多少度
<gadget id="calculator">5 + 4</gadget>
<output>9</output>

<gadget id="calculator">5 / 9</gadget>
<output>5/9 = around 0.555556</output>

<gadget id="calculator">90 * (5/9)</gadget>
<output>50</output>

<result>50</result>