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Geometry
by Mary Sommer
# Geometry

## Classifying Triangles According to Angles

### 1. Acute Triangle

### 2. Right Triangle

### 3. Obtuse Triangle

## Classifying Angles

### 1. Acute Angle

### 2. Obtuse Angle

### 3. Right Angle

### 4. Straight Angle

## Classifying Triangles According to Sides

### 1. Equilateral Triangle

### 2. Isosceles Triangle

### 3. Scalene Triangle

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A triangle that has 3 acute angles. (3 angles less than 90 degrees), Real World Example of an "Acute Triangle"

A triangle that has exactly 1 one right angle. (1 angle measuring exactly 90 degrees), Real World Example of a "Right Triangle"

A triangle that has exactly 1 obtuse angle. (1 angle measuring greater than 90 degrees, but less than 180 degrees), Real World Example of an "Obtuse Triangle"

Acute Angle--An angle that is less than or smaller than 90 degrees., Real World Example of an "Acute Angle"

Definition: Obtuse Angle--An angle greater than 90 degrees but less than 180 degrees.

Obtuse Angle--An angle greater than 90 degrees but less than 180 degrees., Real World Example of an "Obtuse Angle"

Right Angle--An angle measuring exactly 90 degrees.

Right Angle--An angle measuring exactly 90 degrees., Real World Example of a "Right Angle"

Straight Angle--An angle measuring exactly 180 degrees, also known as a line., Real World Example of a "Straight Angle"

A triangle that has 3 sides of equal length & 3 angles of equal measure., Real World Example of an "Equilateral Triangle"

A triangle that has only 2 sides of equal length., Real World Example of an "Isosceles Triangle"

A triangle that has no sides of equal length., Real World Example of a "Scalene Triangle"