2.
\((1)\)一个平面图形的直观图是一个底角为\(45^{\circ}\),腰和上底均为\(1\)的等腰梯形,那么原平面图形的面积是__________.
\((2)\)过直线\(x+y-3=0和2x+y=0 \)的交点,且与直线\(2x+y-5=0\)垂直的直线方程是_________.
\((3)\)实数\(x\),\(y\)满足\(\begin{cases}x-y+1\leqslant 0 \\ x > 0 \\ y\leqslant 2\end{cases} \),则\(\dfrac{y}{x-4}\)的最小值为____________.
\((4)\)已知圆\(C\):\((\)\(x\)\(-3)^{2}+(\)\(y\)\(-4)^{2}=1\)和两点\(A(-\)\(m\),\(0)\),\(B(\)\(m\),\(0)(\)\(m\)\( > 0)\),若圆\(C\)上不存在点\(P\),使得\(∠APB\)为直角,则实数\(m\)的取值范围是___________.