Cone
[]Cone
[{{$x_1$, $y_1$, $z_1$}, {$x_2$, $y_2$, $z_2$}}, r]Cone
[{{$x_1$, $y_1$, $z_1$}, {$x_2$, $y_2$, $z_2$}, ... }, r]Graphics3D[Cone[]]
Graphics3D[Cone[{{0, 0, 0}, {1, 1, 1}}, 1]]
Graphics3D[{Yellow, Cone[{{-1, 0, 0}, {1, 0, 0}, {0, 0, Sqrt[3]}, {1, 1, Sqrt[3]}}, 1]}]