Unit

Description:

Students prove that the area of a triangle is one-half times the product of two side lengths times the sine of the included angle and solve problems using this formula.Students find the area of an isosceles triangle given the base length and the measure of one angle.Teacher and Student versions of full lesson from engageNY

Subjects:

• Mathematics > General
• Mathematics > Geometry

triangle area

English

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Update Standards?

CCSS.Math.Practice.MP1: Common Core State Standards for Mathematics

Make sense of problems and persevere in solving them.

CCSS.Math.Practice.MP2: Common Core State Standards for Mathematics

Reason abstractly and quantitatively.

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.D.9: Common Core State Standards for Mathematics

(+) Derive the formula A = 1/2 ab sin(C) for the area of a triangle by drawing an auxiliary line from a vertex perpendicular to the opposite side.
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