HSG-SRT.D.9

(+) 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.

 
11 Lesson(s)
   

Unit Review Game: Categories

12th Grade Math » Unit: Additional Trigonometry Topics
12th Grade Math » Unit: Additional Trigonometry Topics
Tim  Marley
Troy, MI
Environment: Suburban
 
Big Idea:

The review game Categories is a fun way to review the Law of Sines, Law of Cosines, vectors, and complex numbers.

 
Favorites (4)
 
Resources (9)
 
Reflections (1)
untitled
   

Formative Assessment: Formulas and Vectors

12th Grade Math » Unit: Additional Trigonometry Topics
12th Grade Math » Unit: Additional Trigonometry Topics
Tim  Marley
Troy, MI
Environment: Suburban
 
Big Idea:

Use Math Graffiti to review for today's quiz.

 
Favorites (1)
 
Resources (8)
untitled
   

Trigonometry from a Geometric Perspective

12th Grade Math » Unit: Additional Trigonometry Topics
12th Grade Math » Unit: Additional Trigonometry Topics
Tim  Marley
Troy, MI
Environment: Suburban
 
Big Idea:

Use the Law of Sines, Law of Cosines, SAS Area Formula, and SOH CAH TOA to solve problems involving triangles.

 
Favorites (2)
 
Resources (7)
untitled
   

Area of Triangles

12th Grade Math » Unit: Solving Problems Involving Triangles
12th Grade Math » Unit: Solving Problems Involving Triangles
Katharine Sparks
Independence, MO
Environment: Suburban
 
Big Idea:

Why does (1/2)*a*b*sin(C) give the area of a triangle?

 
Favorites (2)
 
Resources (19)
 
Reflections (2)
area of triangle
   

The Law of Sines: More than Meets the Eye

12th Grade Math » Unit: Additional Trigonometry Topics
12th Grade Math » Unit: Additional Trigonometry Topics
Tim  Marley
Troy, MI
Environment: Suburban
 
Big Idea:

Using the Law of Sines will throw your students for a loop - there are two possible answers!

 
Favorites (1)
 
Resources (10)
 
Reflections (1)
untitled
   

Unit Review: Additional Trigonometry Topics

12th Grade Math » Unit: Additional Trigonometry Topics
12th Grade Math » Unit: Additional Trigonometry Topics
Tim  Marley
Troy, MI
Environment: Suburban
 
Big Idea:

Give your students time to grapple with the important concepts of this unit.

 
Favorites (1)
 
Resources (6)
untitled
   

Solving Triangles Assessment

12th Grade Math » Unit: Solving Problems Involving Triangles
12th Grade Math » Unit: Solving Problems Involving Triangles
Katharine Sparks
Independence, MO
Environment: Suburban
 
Big Idea:

Students will demonstrate their understanding of Law of Sines, Law of Cosines, and right triangles through an assessment.

 
Favorites (1)
 
Resources (3)
copy of test
   

SAS Area Formula

Geometry » Unit: Right Triangles and Trigonometry
Geometry » Unit: Right Triangles and Trigonometry
Anthony Carruthers
Pasadena, CA
Environment: Suburban
 
Big Idea:

Batteries not included...but the angle must be. Some assembly required. In this lesson students build a new triangle area formula and learn when and how to apply it.

 
Favorites (2)
 
Resources (10)
 
Reflections (2)
triangle diagram
   

Review of Solving Triangles Day 1 of 2

12th Grade Math » Unit: Solving Problems Involving Triangles
12th Grade Math » Unit: Solving Problems Involving Triangles
Katharine Sparks
Independence, MO
Environment: Suburban
 
Big Idea:

By creating problems for others to solve, students will review solving triangles using multiple methods.

 
Resources (12)
 
Reflections (1)
review day 1 image
   

Review of Solving Triangles Day 2 of 2

12th Grade Math » Unit: Solving Problems Involving Triangles
12th Grade Math » Unit: Solving Problems Involving Triangles
Katharine Sparks
Independence, MO
Environment: Suburban
 
Big Idea:

By sharing individual examples students will review for an assessment on solving problems involving triangles.

 
Resources (15)
 
Reflections (2)
review assessment
   

Review for Trigonometry Unit Assessment

Geometry » Unit: Triangle Similarity and Trigonometric Ratios
Geometry » Unit: Triangle Similarity and Trigonometric Ratios
Jessica Uy
Sunnyvale, CA
Environment: Suburban
 
Big Idea:

In this review lesson, students will apply their understanding of triangle similarity and trigonometry to write proofs.

 
Resources (10)
example with
Common Core Math
 
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