One base angle of an isosceles triangle is equal to (1/4) of the top angle, what is the one base angle of this triangle?
一个等腰三角形的一个底角等于顶角的(1/4)，这个三角形的一个底角是多少度？
<gadget id="calculator">1 / 4</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">(1/4) + (1/4) + 1</gadget>
<output>3/2 = around 1.5</output>

<gadget id="calculator">180 / (3/2)</gadget>
<output>120</output>

<result>120</result>