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#### Description:

This is a task from the Illustrative Mathematics website that is one part of a complete illustration of the standard to which it is aligned. Each task has at least one solution and some commentary that addresses important asects of the task and its potential use. Here are the first few lines of the commentary for this task: In the figure, \$ABCD\$ is a rectangle and \$\angle CAD = 31^{\circ}\$. Find \$\angle BAC\$....

#### Subjects:

• Mathematics > General
• Education > General

#### Keywords:

Informal Education,oai:nsdl.org:2200/20130211105433678T,NSDL,Grade 4,Upper Elementary,NSDL_SetSpec_ncs-NSDL-COLLECTION-000-003-112-103,Elementary School,Vocational/Professional Development Education,Mathematics,Education

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Update Standards?

#### CCSS.Math.Content.4.MD.C.7: Common Core State Standards for Mathematics

Recognize angle measure as additive. When an angle is decomposed into non-overlapping parts, the angle measure of the whole is the sum of the angle measures of the parts. Solve addition and subtraction problems to find unknown angles on a diagram in real world and mathematical problems, e.g., by using an equation with a symbol for the unknown angle measure.

#### CCSS.Math.Content.4.G.A.2: Common Core State Standards for Mathematics

Classify two-dimensional figures based on the presence or absence of parallel or perpendicular lines, or the presence or absence of angles of a specified size. Recognize right triangles as a category, and identify right triangles.
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