# Reporting Category 3 (TEKS 6.8 Geometry)

#### Geometry and measurement

The videos in this post explain **mathematics Texas Essential Knowledge and Skill 6.8**:

Expressions, equations, and relationships. The student applies mathematical process standards to use geometry to represent relationships and solve problems.

*The STAAR videos below are selected released items from 6th grade STAAR tests in 2016, 2018, 2019, and 2021. You can view the complete review of the 2017 STAAR test *__here__*.*

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## 6.8A

extend previous knowledge of triangles and their properties to include the sum of angles of a triangle, the relationship between the lengths of sides and measures of angles in a triangle, and determining when three lengths form a triangle

### Teaching video

### STAAR Videos

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## 6.8B

model area formulas for parallelograms, trapezoids, and triangles by decomposing and rearranging parts of these shapes

### Teaching videos

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## 6.8C

write equations that represent problems related to the area of rectangles, parallelograms, trapezoids, and triangles and volume of right rectangular prisms where dimensions are positive rational numbers

### Teaching videos

### STAAR Videos

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## 6.8D

determine solutions for problems involving the area of rectangles, parallelograms, trapezoids, and triangles and volume of right rectangular prisms where dimensions are positive rational numbers

### Teaching video

### STAAR Videos

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To view all the posts for the 6th Grade Reporting Category 3 review, click __here__.