2
2 thats it
one solution
exactly one
2. actually, none, the lines are intersecting
Exactly one plane in each case.
2
Think you just answered your own question. A plane is a line. Two planes= two lines.
I'm not entirely certain what you're asking. Any pair of intersecting lines are of necessity coplanar, (assuming Euclidean geometry) though.
Two intersecting straight lines uniquely define one single plane.
there are 4 intersecting lines
A minimum of two.
The abdominopelvic region can be divided into four quadrants using the transverse and vertical planes intersecting at the umbilicus, and into nine regions using two transverse and two vertical planes intersecting at the midclavicular lines.
3 intersecting lines, because none of the three points are right angles.
2
it has 2
2 thats it