## Prove theorems about triangles. Theorems include: a line parallel to one side of a triangle divides the other two proportionally, and conversely; the Pythagorean Theorem proved using triangle similarity.

12 Lesson(s)

### Re-Calling Pythagoras' Theorem

Geometry » Unit: Three Triangle Topics
Geometry » Unit: Three Triangle Topics
Saratoga Springs, NY
Environment: Suburban

Big Idea:

Standards:

Favorites (3)

Resources (19)

Reflections (2)

### Prove It (Part 2)

Geometry » Unit: Similar and Right Triangles
Geometry » Unit: Similar and Right Triangles
Amsterdam, NY
Environment: Urban

Big Idea:

Standards:

Favorites (1)

Resources (12)

### Proving Pythagoras' Theorem

Geometry » Unit: Sweet Similar Shapes
Geometry » Unit: Sweet Similar Shapes
Saratoga Springs, NY
Environment: Suburban

Big Idea:

#### Students will first explore similarity relationships between triangles and then will in a step by step checklist, prove the Pythagorean Theorem using similar triangles.

Standards:

Resources (17)

Reflections (1)

Geometry » Unit: Similarity in Triangles
New York, NY
Environment: Urban

Big Idea:

Standards:

Favorites (1)

Resources (15)

### Review Day for Sweet Similar Shapes

Geometry » Unit: Sweet Similar Shapes
Geometry » Unit: Sweet Similar Shapes
Saratoga Springs, NY
Environment: Suburban

Big Idea:

#### Students will use the SMART Clickers to review key topics for this unit like, identifying similar shapes, and then complete a practice test.

Standards:

Resources (14)

Geometry » Unit: Similarity
Environment: Suburban

Big Idea:

Standards:

Resources (22)

Reflections (1)

### Special Right Triangles

Geometry » Unit: Right Triangles and Trigonometry
Geometry » Unit: Right Triangles and Trigonometry
Environment: Suburban

Big Idea:

#### Word on the streets is there's a cat giving kids the long and short of special right triangles...tune in to find out what the fuss is all about.

Standards:

Favorites (5)

Resources (16)

Reflections (2)

Geometry » Unit: Analytic Geometry
Environment: Suburban

Big Idea:

#### As they say in real estate..."Location, Location, Location." In this lesson, students experience the impact of positioning when writing coordinate proofs.

Standards:

Resources (22)

Reflections (1)

Geometry » Unit: Developing Logic and Proof
Geometry » Unit: Developing Logic and Proof
Environment: Suburban

Big Idea:

#### Proof Power! In this lesson, students the theorems we've proven make it possible to prove a host of other theorems.

Standards:

Resources (6)

Geometry » Unit: Similarity
Environment: Suburban

Big Idea:

#### 9 steps for one and 3/4 of a dozen for the other. In this lesson students will learn to write two 9-step proofs that involve similar triangles.

Standards:

Resources (17)

Reflections (1)

Geometry » Unit: Developing Logic and Proof
Environment: Suburban

Big Idea:
Standards:

Favorites (1)

Resources (12)

### Review for Trigonometry Unit Assessment

Geometry » Unit: Triangle Similarity and Trigonometric Ratios
Geometry » Unit: Triangle Similarity and Trigonometric Ratios
Sunnyvale, CA
Environment: Suburban

Big Idea:

Standards:

Resources (10)
Common Core Math