Polygon Properties & Angles

Regular Pentagon

5 Sides

Interior Angle 108.0°

Exterior Angle 72.0°

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Configurations

Number of Sides (n) 5

3 12 25

Show Diagonals Display Angles Show Exterior lines

Mathematical Analysis

Sum of Interior Angles 540°

Total Diagonals 5

Total Line Segments 10 Format: n(n - 1) / 2

Reference Formulas

Interior Angle = 180 - (360/n)

Exterior Angle = 360/n

Sum of Exterior = 360°