## Use congruence and similarity criteria for triangles to solve problems and to prove relationships in geometric figures.

41 Lesson(s)

### Special Right Triangles Puzzle Activity

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

Big Idea:

Standards:

Favorites (57)

Resources (11)

### Similar Figures Activity

Geometry » Unit: Similar Figures
Geometry » Unit: Similar Figures
Amsterdam, NY
Environment: Urban

Big Idea:

Standards:

Favorites (19)

Resources (13)

### The Rope Stretcher

Geometry » Unit: Area Relationships
Geometry » Unit: Area Relationships
Ault, CO
Environment: Rural

Big Idea:

#### Students apply the Pythagorean Theorem and criteria for triangle congruence in a proof...and learn how the ancient pyramids of Egypt were laid out.

Standards:

Favorites (10)

Resources (26)

Geometry » Unit: Similar Figures
Amsterdam, NY
Environment: Urban

Big Idea:

#### Students create and investigate their own concave similar polygons.

Standards:

Favorites (8)

Resources (15)

Geometry » Unit: Similar Figures
Amsterdam, NY
Environment: Urban

Big Idea:

Standards:

Favorites (9)

Resources (10)

### CPCTC

Geometry » Unit: Proofs about Triangles
Geometry » Unit: Proofs about Triangles
New York, NY
Environment: Urban

Big Idea:

Standards:

Favorites (5)

Resources (14)

### Dilation and Similarity Unit Test

Geometry » Unit: Scaling Up- Dilations, Similarity and Proportional Relationships
Geometry » Unit: Scaling Up- Dilations, Similarity and Proportional Relationships
Ault, CO
Environment: Rural

Big Idea:

#### Students will show what they know!

Standards:
HSG-SRT.A HSG-SRT.B.5

Favorites (2)

Resources (20)

### Building a Kicker Ramp

Geometry » Unit: Introduction to Trigonometry
Geometry » Unit: Introduction to Trigonometry
Ault, CO
Environment: Rural

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Standards:

Favorites (20)

Resources (26)

### Introduction to Similar Right Triangles

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

Big Idea:

#### Students investigate the three similar right triangles created by the altitude to the hypotenuse of a right triangle.

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Favorites (8)

Resources (19)

Reflections (1)

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

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Favorites (5)

Resources (17)

### AAS and ASA Fun

Geometry » Unit: Tremendous Triangles
Geometry » Unit: Tremendous Triangles
Saratoga Springs, NY
Environment: Suburban

Big Idea:

#### Students will work with a partner to discover two more theorems as they explore why ASA and AAS congruence proves triangles are congruent.

Standards:

Favorites (4)

Resources (22)

Reflections (2)

Geometry » Unit: Similar Figures
Amsterdam, NY
Environment: Urban

Big Idea:

Favorites (7)

Resources (9)

### Using the Pythagorean Theorem

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

Big Idea:

Standards:

Favorites (7)

Resources (10)

### SAS-sy Triangles

Geometry » Unit: Tremendous Triangles
Geometry » Unit: Tremendous Triangles
Saratoga Springs, NY
Environment: Suburban

Big Idea:

Standards:

Favorites (5)

Resources (35)

Reflections (5)

### 30, 60, 90 Triangles

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

Big Idea:

Standards:

Favorites (3)

Resources (12)
Common Core Math