Geometry Fundamentals: Points, Lines, Angles, and Coordinate Plane Practice

Fill-in-the-blank practice flashcards covering geometry definitions, postulates, angle relationships, coordinate formulas, and polygon properties.

In geometry, a point is an undefined term that has __________ dimension.

no

Through any two points, there is exactly __________ line.

one

Through any three points not on the same line, there is exactly __________ plane.

one

Points that lie on the same line are called __________ points.

collinear

Points that lie in the same plane are called __________ points.

coplanar

A line segment consists of two __________ and all points on the line between them.

endpoints

Two rays that have the same endpoint and form a line are called __________.

opposite rays

The intersection of two distinct planes is a __________.

line

In geometry, a rule that is accepted without proof is called a __________ or an axiom.

postulate

The Segment Addition Postulate states that if $B$ is between $A$ and $C$, then $AB + BC =$ __________.

$$AC$$

The __________ of a segment is the point that divides the segment into two congruent segments.

midpoint

A point, ray, line, line segment, or plane that intersects a segment at its midpoint is called a __________.

segment bisector

The Midpoint Formula for endpoints $(x_1, y_1)$ and $(x_2, y_2)$ in a coordinate plane is $(\frac{x_1 + x_2}{2},$ __________$)$.

$$y_1+y_22$$

The Distance Formula between two points $A(x_1, y_1)$ and $B(x_2, y_2)$ is $AB = \sqrt{(x_2 - x_1)^2 +}$ __________.

$$(y_2 - y_1)^2$$

An angle is formed by two different rays that share a common endpoint called the __________.

vertex

A ray that divides an angle into two congruent angles is called an __________.

angle bisector

Two angles that share a common vertex and side, but have no common interior points, are called __________ angles.

adjacent

Complementary angles are two positive angles whose measures have a sum of __________.

$$90^\circ$$

Supplementary angles are two positive angles whose measures have a sum of __________.

$$180^\circ$$

Two adjacent angles form a __________ when their noncommon sides are opposite rays.

linear pair

Two angles are __________ angles when their sides form two pairs of opposite rays.

vertical

A polygon is a closed plane figure formed by three or more line segments called __________.

sides

A polygon is __________ when no line that contains a side contains a point in the interior of the polygon.

convex

A polygon with 12 sides is named a __________.

dodecagon