CCSS.Math.Practice.MP2: Common Core State Standards for Mathematics
Reason abstractly and quantitatively.
CCSS.Math.Practice.MP3: Common Core State Standards for Mathematics
Construct viable arguments and critique the reasoning of others.
CCSS.Math.Practice.MP4: Common Core State Standards for Mathematics
Model with mathematics.
CCSS.Math.Practice.MP5: Common Core State Standards for Mathematics
Use appropriate tools strategically.
CCSS.Math.Practice.MP6: Common Core State Standards for Mathematics
Attend to precision.
CCSS.Math.Practice.MP7: Common Core State Standards for Mathematics
Look for and make use of structure.
CCSS.Math.Content.HSG-SRT.C.6: Common Core State Standards for Mathematics
Understand that by similarity, side ratios in right triangles are properties of the angles in the triangle, leading to definitions of trigonometric ratios for acute angles.