If the apex angle of an isosceles triangle is 64°, what is the measure of each base angle?
一个等腰三角形的顶角是64°，它的每个底角是多少度．
<gadget id="calculator">180 - 64</gadget>
<output>116</output>

<gadget id="calculator">116 / 2</gadget>
<output>58</output>

<result>58</result>