One interior angle of a triangle is 86°, which is twice the other interior angle, so what is the third interior angle?
三角形中一个内角是86°，是另一个内角的2倍，那么第三个内角是多少度？
<gadget id="calculator">86 / 2</gadget>
<output>43</output>

<gadget id="calculator">180 - 86 - 43</gadget>
<output>51</output>

<result>51</result>