intersecting lines
A ray.
In general, any 10-sided polyhedron is called a decahedron. With 10 regular triangles for faces, you may have a pentagonal bipyramid.
Square Based PyramidTetrahedron: A tetrahedron is a polyhedron made of 4 triangles. A "regular tetrahedron" is a tetrahedron where the triangles are equilateral. (A polyhedron is any 3 dimentional figure made of flat surfaces and straight lines.)
I would call it a 25-hedron because I want to communicate rather than obfuscate.If I wanted to obfuscate or be pretentious I would call it an icosipentahedron.
A pentagonal pyramid.
It is the vertex whose plural is vertices
cube
intersecting lines
no
Actually points do not intersect. They can be super-imposed if they are in the same location. Lines intersect.
A ray.
A ray.
line segment
Two planes that intersect are simply called a plane to plane intersection. When they intersect, the intersection point is simply called a line.
They are perpendicular lines that intersect at right angles or 90 degrees
cap