The ratio of the two angles of an isosceles triangle is 7:1, what is the maximum angle of the triangle.
一个等腰三角形中两个角的比是7：1，这个三角形的顶角最大是多少度．
<gadget id="calculator">7 / 7 / 1</gadget>
<output>1</output>

<gadget id="calculator">7 + 1 + 1</gadget>
<output>9</output>

<gadget id="calculator">7 / 9</gadget>
<output>7/9 = around 0.777778</output>

<gadget id="calculator">180 * (7/9)</gadget>
<output>140</output>

<result>140</result>