Exterior Angle of a Regular Polygon Calculator
⬛ Area & perimeter (2D). Use the Exterior angle of a regular polygon formula to find exterior angle, number of sides: pick the value you want, type the others, and the answer updates as you go.
Each interior angle is 180° − e.
Exterior angle72 °
Pick the ○ next to the value you want to find, fill in the others, and it solves as you type.
What each letter means
| Quantity | Unit |
|---|---|
| Exterior angle | ° |
| Number of sides | no unit |
Worked example
Find the exterior angle when Number of sides = 5.
Using e = 360°/n: Exterior angle = 72 °.
Frequently asked questions
What is the formula for Exterior angle of a regular polygon?
e = 360°/n. Each interior angle is 180° − e.
What do the letters stand for, and what units are used?
Exterior angle in °, Number of sides.
How do you calculate exterior angle?
Put the values into e = 360°/n. For example, with Number of sides = 5, exterior angle = 72 °.
Can I solve for a different value?
Yes. In the calculator above, pick the circle next to any value (exterior angle, number of sides) and fill in the others: it rearranges the formula for you.
