Question

What is the fewest number of intersection points that two planes can have?

Answer 1

Answer: 4 points

Explanation:

The minimum number of points needed to define two distinct planes is 4 points. Two distinct planes can be defined by 4 points under the conditions that the two distinct planes intersect at a line, and two points exist on that line that are shared between the planes.

Answer 2

One line of intersection (three points of intersection)

Explanation:

When two planes intersect, they don't form points of intersection, but they form a line of intersection.

From equation of a line,

`{ \tt{ax + by + cz = 0}}`

x, y, z are points of intersection