If one angle of a triangle is 80 degrees and the other two angles are equal in degree, what is the degree of one of the two angles?
如果一个三角形的一个角为80度，另外两个角的度数相等，那么这两个角中其中一个角等于多少度．
<gadget id="calculator">180 - 80</gadget>
<output>100</output>

<gadget id="calculator">100 / 2</gadget>
<output>50</output>

<result>50</result>