The number of symmetry axes of a square, an equilateral triangle, and a sector are A, B, and C respectively, then: A**2+B+C=how much.
正方形、等边三角形、扇形的对称轴的个数分别为A、B、C，则：A**2+B+C=多少．
<gadget id="calculator">4 ** 2</gadget>
<output>16</output>

<gadget id="calculator">16 + 3 + 1</gadget>
<output>20</output>

<result>20</result>