Special right triangles: 45-45-90 and 30-60-90
Start lessonBegins with Exercise · Practice
Teacher tools for this standard
Lesson Plan · Guided Notes · Exit Ticket · Re-teach · Homework
Teacher tools for this standard
Lesson Plan · Guided Notes · Exit Ticket · Re-teach · Homework
- Lesson Plan →Objectives, pacing and practice, built from this lesson's brief.
- Guided Notes →One page your students fill in and keep.
- Exit Ticket →Three items at the end of class. No student accounts.
- Re-teach →After an exit ticket: who missed what, and what to do tomorrow.
- Homework →Assign practice; it grades itself.
"Solve problems in a variety of contexts using: ... • properties of special right triangles."
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"Solve problems in a variety of contexts using: ... • properties of special right triangles."
What you'll learn
- State the side ratios for 45-45-90 triangles (1 : 1 : sqrt(2)) and 30-60-90 triangles (1 : sqrt(3) : 2)
- Derive the 45-45-90 ratio by cutting a unit square along its diagonal
- Derive the 30-60-90 ratio by bisecting an equilateral triangle
- Find any missing side of a special right triangle given one side
- Solve SAT-style problems that embed special right triangles in larger figures
Slides
Step through the lesson, or watch it as a narrated video
Slides
In development
Not yet available • Check back soon!
Practice
Try it on your own
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