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

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.