# Unit 7 Angles and Angle Measurement (Family Materials)

In this unit, students are introduced to the structure of the coordinate grid, and the convention and notation of coordinates to name points. They classify triangles and quadrilaterals in a hierarchy based on properties of side length and angle measure. In their work with numerical patterns, students generate two different numerical patterns, and identify relationships between the corresponding terms in the patterns.

Near the end of the unit, ask your student to solve the following problem:

This coordinate grid represents information about rectangles A–D. Based on the coordinate grid, what do we know about each of these rectangles?

Questions that may be helpful as they work:

• What strategy are you going to use to help you solve the problem?

• How can you show the rectangles represented by these points on the grid?

• Add another point to the grid that represents a different rectangle and describe the rectangle to me.

## Section A Points, Lines, Segments, Rays, and Angles

In this section, students explore the coordinate grid.

• They recognize that a point is located where two lines intersect.

• They describe points on the grid based on the numbers on the horizontal and vertical axes.

For example, the point shown is located at .

## Section B The Size of Angles

In this section, students learn more about shapes. They sort different types of triangles and quadrilaterals based on what the shapes have in common. They classify the shapes into categories and subcategories. For example,

## Section C Angle Analysis

In this section, students generate patterns and explore relationships between patterns. For example: