Triangle Centers:

1. Centroid (G)

2. Orthocenter (H)

3. Circumcenter (C)

4. Incenter (I)

Special Triangles:

1. Medial Triangle

2. Orthic Triangle

3. Pedal Triangle

Using Centers of a Triangle:

1. Circumcircle

2. Incircle

3. Center of a Nine-point circle

4. Nine-point circle

Regular Polygons:

1. Equilateral Triangle

2. Square

3. Hexagon

4. Pentagon

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