In a right triangle, the ratio of the two acute angles is 1:8, what is the difference between the two acute angles?
一个直角三角形中，两个锐角度数的比是1：8，两个锐角差是多少度．
<gadget id="calculator">1 + 8</gadget>
<output>9</output>

<gadget id="calculator">90 / 9</gadget>
<output>10</output>

<gadget id="calculator">8 - 1</gadget>
<output>7</output>

<gadget id="calculator">10 * 7</gadget>
<output>70</output>

<result>70</result>