If a rectangle, a square, and a regular triangle have a, b, and c axes of symmetry respectively, then (a+b+c)**2=how many.
如果长方形，正方形，正三角形分别有a，b，c条对称轴，则(a+b+c)**2=多少．
<gadget id="calculator">2 + 4 + 3</gadget>
<output>9</output>

<gadget id="calculator">9 ** 2</gadget>
<output>81</output>

<result>81</result>