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# 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

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## 6.8B

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

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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

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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

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