1.一个正三棱锥的侧面积都是直角三角形,底面边长为a,求它的表面积2.正方体的表面积为a²,它的顶点都在同一个球面上,这个球的表面积是( )A.πa²/3 B.πa²/2 C.2πa² D.3πa²
来源:学生作业帮助网 编辑:作业帮 时间:2024/07/18 22:19:19
![1.一个正三棱锥的侧面积都是直角三角形,底面边长为a,求它的表面积2.正方体的表面积为a²,它的顶点都在同一个球面上,这个球的表面积是( )A.πa²/3 B.πa²/2 C.2πa² D.3πa²](/uploads/image/z/13187030-14-0.jpg?t=1.%E4%B8%80%E4%B8%AA%E6%AD%A3%E4%B8%89%E6%A3%B1%E9%94%A5%E7%9A%84%E4%BE%A7%E9%9D%A2%E7%A7%AF%E9%83%BD%E6%98%AF%E7%9B%B4%E8%A7%92%E4%B8%89%E8%A7%92%E5%BD%A2%2C%E5%BA%95%E9%9D%A2%E8%BE%B9%E9%95%BF%E4%B8%BAa%2C%E6%B1%82%E5%AE%83%E7%9A%84%E8%A1%A8%E9%9D%A2%E7%A7%AF2.%E6%AD%A3%E6%96%B9%E4%BD%93%E7%9A%84%E8%A1%A8%E9%9D%A2%E7%A7%AF%E4%B8%BAa%26sup2%3B%2C%E5%AE%83%E7%9A%84%E9%A1%B6%E7%82%B9%E9%83%BD%E5%9C%A8%E5%90%8C%E4%B8%80%E4%B8%AA%E7%90%83%E9%9D%A2%E4%B8%8A%2C%E8%BF%99%E4%B8%AA%E7%90%83%E7%9A%84%E8%A1%A8%E9%9D%A2%E7%A7%AF%E6%98%AF%EF%BC%88+%EF%BC%89A.%CF%80a%26sup2%3B%EF%BC%8F3+B.%CF%80a%26sup2%3B%EF%BC%8F2+C.2%CF%80a%26sup2%3B+D.3%CF%80a%26sup2%3B)
xSJ@$!Rs#>V->+>* hE'$73qH;э0ιsD/Z{]n%zɪߩG痤ވvp a} K7kpvݦ)+ކaHt*-ј
>s
98MZLUWެ2}1L*'2S}nQ=o&@~6O2^s" bA#߭{Wk?4K*àY`JG`$JjƎ
1%Xdć~zpMw}HChBZnx M`ld5Lf