### Clarifications

*Clarification 1:*Instruction includes classifying angles using benchmark angles of 90° and 180° in two-dimensional figures.

*Clarification 2: *When identifying angles, the expectation includes two-dimensional figures and real-world pictures.

**Subject Area:**Mathematics (B.E.S.T.)

**Grade:**4

**Strand:**Geometric Reasoning

**Standard:**Draw, classify and measure angles.

**Date Adopted or Revised:**08/20

**Status:**State Board Approved

## Related Courses

## Related Access Points

## Related Resources

## Formative Assessments

## Image/Photograph

## Lesson Plans

## Original Student Tutorials

## Problem-Solving Task

## Tutorials

## MFAS Formative Assessments

Students are asked to identify right, acute, and obtuse angles in a two-dimensional figure, and explain the differences among these types of angles.

Students are asked to circle figures that show angles from a set of figures and then describe the defining attributes of angles.

## Original Student Tutorials Mathematics - Grades K-5

Classify and name angles in two-dimensional shapes to help a robot create a path using angles in this interactive tutorial.

Identify right triangles and explain the properties shared by all right triangles in this interactive tutorial.

## Student Resources

## Original Student Tutorials

Classify and name angles in two-dimensional shapes to help a robot create a path using angles in this interactive tutorial.

Type: Original Student Tutorial

Identify right triangles and explain the properties shared by all right triangles in this interactive tutorial.

Type: Original Student Tutorial

## Problem-Solving Task

The purpose of this task is to give students a problem involving an unknown quantity that has a clear visual representation. Students must understand that the four interior angles of a rectangle are all right angles and that right angles have a measure of 90° and that angle measure is additive.

Type: Problem-Solving Task

## Tutorials

This Khan Academy tutorial video identifies acute, right, and obtuse angles and justifies each identification.

Type: Tutorial

This Khan Academy tutorial video demonstrates the relationship between the measurement of an angle and the arc of a circle.

Type: Tutorial

This Khan Academy tutorial video presents how an angle is formed and labeled.

Type: Tutorial

## Parent Resources

## Image/Photograph

In this lesson, you will find clip art and various illustrations of polygons, circles, ellipses, star polygons, and inscribed shapes.

Type: Image/Photograph

## Problem-Solving Task

The purpose of this task is to give students a problem involving an unknown quantity that has a clear visual representation. Students must understand that the four interior angles of a rectangle are all right angles and that right angles have a measure of 90° and that angle measure is additive.

Type: Problem-Solving Task