An isosceles triangle has a vertex angle of 68 degrees. So what is the measure of its base angle?
一个等腰三角形，它的顶角度数是68度．那么，它的底角的度数是多少？
<gadget id="calculator">180 - 68</gadget>
<output>112</output>

<gadget id="calculator">112 / 2</gadget>
<output>56</output>

<result>56</result>