指考甲93壹(二)3正四面體

兩平面夾角 angles between two planes

兩歪斜線 wo skew lines

intersection of a sphere and a plane

a plane det by a point and a line

a plane det by two intersection lines.

a plane det by two parallel lines

intersection of a sphere and a plane

a plane passing two pts and othogonal to  a given plane

intersetion of a sphere and a plane with d greater than r

intersection of a sphere and a plane with d less than r

intersetion of a sphere and a plane with d=r

tangent plane of a sphere

intersection of a sphere and a plane with d=r

ta cube came from a tetrahedron

指考甲90(5)