b & c
Two planes intersect at a line
yes, three planes can intersect in one point.
Not sure if this is the official definition, but i think it is something like "two lines are parallel if they could extend to infinity and never cross"
Perpendicular lines always intersect and make 90 degree angles. Parallel lines never intersect with each other.
No, 2 planes may only intersect at a line, a plane, or not at all. THREE planes may intersect at a point though...
Perpendicular is when opposite angles that are formed when two lines intersect and are congruent called?
A kite has two pairs of adjacent sides congruent. The diagonals intersect at right angles and bisect one set of angles.
No, the diagonals of a rhombus are not congruent, but they do intersect each other at 90 degrees.
That is an important theorem in geometry: if two lines intersect to form adjacent congruent angles, then the lines are perpendicular. Those congruent angles would be right angles.
No but they do intersect each other at right angles
No, but they intersect each other at right angles
2 circles that intersect each other
No but they intersect each other at right angles
Vertical angel
Yes
The question does not make sense. Parallel lines, by definition, do not intersect.
yes