Chapters

### Perimeter of a Triangle

Equilateral Triangle | Isosceles Triangle | Scalene Triangle |

### Area of a Triangle

### Area of an Equilateral Triangle

### Area of a Right Triangle

### Semiperimeter

### Heron's Formula

## Circumscribed Circle in a Triangle

R = radius of the circumscribed circle.

## Circle Inscribed in a Triangle

r = radius of the inscribed circle.

**s = semiperimeter**

## Knowing the Lengths Two Sides and the Angle between them

### Pythagorean Theorem

### Similar Triangles

## Similar Triangle Rules

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