MA 306 Section 10.1 Notes Flashcards


An exact location in space


The set of points that extends infinitely in two opposite directions


A flat surface that extends infinitely in all directions

A ________ is determined by 2 points (Postulate 1)


Collinear points

Are points on the same line

Line segment

A subset of a line that contains two points of the line (end points)
and all points in between those two points


A subset of a line that contains the endpoint and all points on the
line on one side of the endpoint

A ______ is determined by three non collinear points (Postulate 2)


Coplanar points

Are points on the same plane

Skew lines

Are lines that don't intersect, and there is no plane that contains
them (non coplanar)

Parallel lines

Are distinct coplanar lines that have no points in common

What are two points of a line that are in the plane, then the entire
line containing the points is contained in the plane

Postulate 3

What are two distinct planes that intersect then their intersection
is one line.

Postulate 4

Two distinct planes

either intersect in a line or are parallel

An ________ is the union of two rays with a common endpoint

An_____ is measured in degrees

An angle is measured with a _______.


Acute angle

Measures between 0 and 90 degrees

Right angle

Measures exactly 90 degrees

Obtuse angle

Measures between 90 and 180 degrees

Straight angle

Measures exactly 10 degrees

Reflex angle

Measures between 180 and 360 degrees

Perpendicular lines

Are lines that intersect at right angles

Congruent lines



the measure of the Earth "Earth measure