Draw points, lines, line segments, rays, angles (right, acute, obtuse), and perpendicular and parallel lines, and
identify these in two-dimensional figures.

Arkansas Academic Standards:
4.G.A.1

Draw points, lines, line segments, rays, angles (right, acute, obtuse), and perpendicular and parallel lines

Identify these in two-dimensional figures

Common Core State Standards:
Math.4.G.1 or 4.G.A.1

Draw points, lines, line segments, rays, angles (right, acute, obtuse),
and perpendicular and parallel lines. Identify these in two-dimensional
figures.

Georgia Standards of Excellence (GSE):
4.GSR.8.1

Explore, investigate, and draw points, lines, line segments, rays, angles (right, acute, obtuse), perpendicular lines, parallel lines, and lines of symmetry. Identify these in twodimensional figures.

North Carolina - Standard Course of Study:
4.G.1

Draw and identify points, lines, line segments, rays, angles, and perpendicular and parallel lines.

Tennessee Academic Standards:
4.G.A.1

Draw points, lines, line segments, rays, angles (right, acute, obtuse, straight, reflex), and perpendicular and parallel lines. Identify these in two-dimensional
figures.

Pennsylvania Core Standards:
CC.2.3.4.A.1

Draw lines and angles and identify these in two-dimensional figures

Pennsylvania Core Standards:
M04.C-G.1.1.1

Draw points, lines, line segments, rays, angles (right, acute, and obtuse), and perpendicular and parallel lines. Identify these in two-dimensional figures.

Florida - Benchmarks for Excellent Student Thinking:
MA.3.GR.1.1

Describe and draw points, lines, line segments, rays, intersecting lines, perpendicular lines and parallel lines. Identify these in two-dimensional figures

Georgia Standards of Excellence (GSE):
3.GSR.6.1

Identify perpendicular line
segments, parallel line segments,
and right angles, identify these in
polygons, and solve problems
involving parallel line segments,
perpendicular line segments, and
right angles.

Georgia Standards of Excellence (GSE):
4.GSR.8.1

Explore, investigate,
and draw points,
lines, line segments,
rays, angles (right,
acute, obtuse),
perpendicular lines,
parallel lines, and
lines of symmetry.
Identify these in two-dimensional figures.

4th Grade Math - Geometry Terms Lesson

A point is a precise location with no dimensions.

A line segment is a straight path with endpoints.

A ray is a straight path extending infinitely in one direction from an endpoint.

A line is a straight path extending infinitely in both directions.

An angle is formed by the intersection of two line segments, rays, and/or lines.

In diagrams, points are typically represented by a dot.
A letter is typically used to label the dot.
In the diagram [right], there are 4 labeled points.
The points are identified as point A, point B, point C, and point D.

In diagrams, line segments are typically represented by a line with endpoints.
A letter is typically used to label an endpoint.
The endpoints are used for identification.
In the diagram, there are 3 identifiable line segments.
The line segments are: line segment AB, line segment AC, and line segment AD.
The line segments can also be referenced as: AB, AC, and AD.

In diagrams, rays are typically represented by a line with an arrow extending from an endpoint. A letter is typically used to label the endpoint. The endpoint and a second labeled point on the ray are used for identification. The endpoint is listed first.
In the diagram, there are 3 identifiable rays.
The rays are: ray AB, ray AC, and ray CA.
The rays can also be referenced as: $\overrightarrow{\text{AB}}$, $\overrightarrow{\text{AC}}$, and $\overrightarrow{\text{CA}}$.

In diagrams, lines are typically represented by a line with arrows pointing in opposite directions.
Two labeled points on the line are often used for identification.
Sometimes a diagram uses a number or a single lowercase letter, near one of the arrows, to label a line.
In the diagram, there is 1 identifiable line.
The line is line AC, and can also be referenced as $\overleftrightarrow{\text{AC}}$.

Angles are often identified by 3 letter-labeled points (1 on each leg and the vertex).
The vertex point is listed in the middle.
Sometimes a diagram uses a number or a single letter, at the vertex, to label an angle. However, a single letter label is usually not appropriate if there is more than 1 angle associated with that letter.
In the diagram, the identifiable angles are: angle BAC, angle BAD, and angle CAD.
The angles can also be referenced as: ∠BAC, ∠BAD, and ∠CAD.

An acute angle is an angle with a measure less than 90°.

A right angle is an angle with a measure of 90°.

An obtuse angle is an angle with a measure greater than 90°.

acute angle

right angle

obtuse angle

less than 90°

90°

greater than 90°

Parallel lines are lines which do not intersect.

Perpendicular lines are lines which intersect at right angles.