In an isosceles triangle, the measure of the apex angle is twice that of the base angle, what is the base angle?
一个等腰三角形，顶角的度数是底角的2倍，它的底角是多少度多少°
<gadget id="calculator">1 + 1 + 2</gadget>
<output>4</output>

<gadget id="calculator">180 / 4</gadget>
<output>45</output>

<result>45</result>