10.
\((1)\)已知直线的倾斜角的范围是\(\alpha \in \left[ \dfrac{\pi }{4},\dfrac{\pi }{2} \right]\),则此直线的斜率\(k\)的取值范围是_______.
\((2)\)若等比数列\(\left\{ {{a}_{n}} \right\}\)满足\({{a}_{2}}+{{a}_{4}}=20,{{a}_{3}}+{{a}_{5}}=40\),则前\(n\)项\({{S}_{n}}=\) ___ __.
\((3)\)如图,在四边形\(ABCD\)中,已知\(AD\)\(⊥\)\(CD\),\(AD\)\(=10\),\(AB\)\(=14\),\(∠\)\(BDA\)\(=60^{\circ}\),\(∠\)\(BCD\)\(=135^{\circ}\),则\(BC\)的长为_______.
\((4)\)已知三棱柱\(ABC-A_{1}B_{1}C_{1}\)的\(6\)个顶点都在球\(O\)的球面上,若\(AB=3\),\(AC=4\),\(AB⊥AC\),\(AA_{1}=12\),则球\(O\)的半径为_______.