Sometimeslines intersectand sometimesthey do not. Whentwo lines do intersect,the intersectionwill be
a singlepoint.This postulatewill be especiallyimportantwhenlookingat anglesand relationshipsbetween
lines.As an extensionof this, the final postulatefor this lessonstatesthat whentwo planesintersectthey
meetin a singleline. The followingdiagramsshowtheserelationships.
Postulate:The intersectionof any two distinctlines will be a singlepoint.Postulate:The intersectionof two planesis a line.Example 5
How manynon-collinearpointsare requiredto identifya plane?A. 1B. 2