The ratio of the two acute angles of a right triangle is 5:4, what is the greater acute angle?
一个直角三角形的两个锐角的比是5：4，较大的锐角是多少°
<gadget id="calculator">180 - 90</gadget>
<output>90</output>

<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>