It is known that the length of the first side of a triangle is 8 cm, the length of the second side is 7 cm, and the third side is impossible to be
已知三角形的第一边长8厘米，第二边长7厘米，第三边不可能是多少厘米
<gadget id="calculator">8 + 7</gadget>
<output>15</output>

<result>15</result>