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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: Three unit squares and two line segments connecting two pairs of vertices are shown. What is the area of \$\triangle ABC\$?...

#### Subjects:

• Mathematics > General
• Education > General

#### Keywords:

Informal Education,NSDL,NSDL_SetSpec_ncs-NSDL-COLLECTION-000-003-112-103,oai:nsdl.org:2200/20131110173453685T,High School,Vocational/Professional Development Education,Mathematics,Education

English

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Creative Commons Attribution Non-Commercial Share Alike

#### Collections:

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Update Standards?

#### CCSS.Math.Content.HSG-CO.A: Common Core State Standards for Mathematics

Experiment with transformations in the plane

#### CCSS.Math.Content.HSG-SRT.B.5: Common Core State Standards for Mathematics

Use congruence and similarity criteria for triangles to solve problems and to prove relationships in geometric figures.

#### CCSS.Math.Content.HSG-GPE.B.4: Common Core State Standards for Mathematics

Use coordinates to prove simple geometric theorems algebraically.

#### CCSS.Math.Content.HSG-GPE.B.5: Common Core State Standards for Mathematics

Prove the slope criteria for parallel and perpendicular lines and use them to solve geometric problems (e.g., find the equation of a line parallel or perpendicular to a given line that passes through a given point).
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