In this interactive activity, students will be led through steps to construct angles using a protractor. There are teaching activities as well as practice activities available. A handout that describes strategies taught during the interactive is available to be printed. After utilizing this resource, the students can complete the short quiz to assess their understanding.

Content Standard(s):

Mathematics MA2019 (2019) Grade: 4

24. Identify an angle as a geometric shape formed wherever two rays share a common endpoint.

Unpacked Content

Evidence Of Student Attainment:

Students:

Describe an angle.

Describe an angle's relationship to a circle.

Teacher Vocabulary:

Angle

Ray

Endpoint

Geometric shape

Vertex

Line

Point

Line segment

Knowledge:

Students know:

Angles are geometric shapes formed when two rays share a common endpoint.

How to draw points, lines, line segments, and rays

Skills:

Students are able to:

Identify an angle as two rays with a common endpoint.

Understanding:

Students understand that:

angles are geometric shapes made of two rays that are infinite in length and are measured with reference to a circle with its center at the common endpoint of the rays.

Diverse Learning Needs:

Essential Skills:

Learning Objectives: M.4.24.1: Define degree, angle, ray, and vertices.
M.4.24.2: Recognize and draw shapes having specified attributes such as a given number of angles or a given number of equal faces.
M.4.24.3: Estimate angle measures using 45^{o}, 90^{o}, 180^{o}, 270^{o}, or 360^{o}.
M.4.24.4: Identify angle, ray, and vertices.
M.4.24.5: Draw shapes to possess defining attributes.

Prior Knowledge Skills:

Build and draw shapes to possess defining attributes.

Compose two-dimensional shapes (rectangles, squares, trapezoids, triangles, half-circles, and quarter-circles).

Model partitioning circles and rectangles.

Decompose pictures made of simple shapes.

Identify squares, circles, triangles and rectangles.

Explore shapes or figures that can be decomposed into smaller equal parts.

Alabama Alternate Achievement Standards

AAS Standard: M.AAS.4.24 Recognize and Identify angles in geometric shapes as larger or smaller.

Mathematics MA2019 (2019) Grade: 4

25. Use a protractor to measure angles in whole-number degrees and sketch angles of specified measure.

Unpacked Content

Evidence Of Student Attainment:

Students:

Demonstrate using a protractor to measure angles in different orientations to the nearest degree. Example: Given an angle, align the vertex of the angle with the correct point on the protractor, align one ray of the angle with the 0^{o} mark on the protractor, and read where the other ray is located on the protractor.

Draw an angle of a given size using a variety of tools. Example: Draw a ray and use a protractor to construct a 108^{o} angle.

Determine the angle measure when given an image of a protractor with angle rays intersecting the protractor scale.

Example: Given a protractor showing angle rays intersecting the protractor at 83 degrees and 123 degrees. What is the angle measure? Determine the angle measure is 40 degrees.

Teacher Vocabulary:

Protractor

Angle

Whole number

Degree

Center

Circle

Intersect

Arc

Point

Ray

One-degree angle

Vertex

Knowledge:

Students know:

Measurable attributes of geometric shapes, specifically angle size.

Units of measurement, specifically one-degree angle (degrees).

An angle is measured by the number or iterations of one-degree angles that exactly cover the rotation of the angle.

Skills:

Students are able to:

Sketch angles given a specified measure.

Use appropriate tools to find angle measure.

Understanding:

Students understand that:

the rotation of an angle is measured by the number of one-degree angles that exactly cover the rotation of the angle.

Diverse Learning Needs:

Essential Skills:

Learning Objectives: M.4.25.1: Define symmetry.
M.4.25.2: Model using a protractor to draw angles.
M.4.25.3: Measure the length of an object twice, using length units of different lengths for the two measurements; describe how the two measurements relate to the size of the unit chosen.
M.4.25.4: Measure the length of an object by selecting and using appropriate tools such as a ruler.
M.4.25.5: Measure length using standard and non-standard units of measurement.
M.4.25.6: Plot points on grids, graphs, and maps using coordinates.
M.4.25.7: Draw points, lines, line segments, and parallel and perpendicular lines, angles, and rays.
M.4.25.8: Identify lines of symmetry on one-dimensional figures.

Prior Knowledge Skills:

Build and draw shapes to possess defining attributes.

Express the length of an object as a whole number of length units by laying multiple copies of a shorter object (the length unit) end to end; understand that the length measurement of an object is the number of same-size length units that span it with no gaps or overlaps.

Compose two-dimensional shapes (rectangles, squares, trapezoids, triangles, half-circles, and quarter-circles).

Identify a rectangle.

Express the length of an object as a whole number of length units by laying multiple copies of a shorter object (the length unit) end to end; understand that the length measurement of an object is the number of same-size length units that span it with no gaps or overlaps.

Define halves, thirds, fourths, quarters, whole, parts (shares) and equal.

Distinguish between equal and non-qual parts.

Model partitioning circles and rectangles.

Decompose pictures made of simple shapes.

Identify squares, circles, triangles and rectangles.

Explore shapes or figures that can be decomposed into smaller equal parts.

Alabama Alternate Achievement Standards

AAS Standard: M.AAS.4.24 Recognize and Identify angles in geometric shapes as larger or smaller.