geometry calculator

Regular Octagon Apothem Calculator

Regular Octagon Apothem Calculator for coordinate geometry, angles, and diagram-based problems when you want a fixed formula answer without improvising the math by hand.

Estimate

Enter job values, review the estimate, then use the decision hints before ordering or quoting.

Estimate Results

Enter values to see the result.

Check

Mixing units, scales, or coordinate conventions across side length before calculating apothem.
Rounding too early when the result still feeds another geometry or algebra step.

Example

6 units gives Apothem 7. 2426.

Formula

apothem = side / (2 x tan(pi / 8))

Use the regular-polygon apothem relationship for a 8-sided shape with equal sides and angles.

This page assumes a regular regular octagon.

Next Step

Next Calc

Regular Decagon Apothem Calculator

Next: regular decagon apothem.

Next Calc

Regular Hexagon Apothem Calculator

Next: regular hexagon apothem.

Next Calc

Regular Octagon Area Calculator

Next: regular octagon area.

FAQ

When should I keep more decimals for regular octagon apothem calculator?

Keep more precision when the output will feed another formula, drawing, coordinate step, or comparison rather than being rounded once and left alone.

Important Use Notice

Informational calculator only. Verify important outputs independently before legal, tax, medical, engineering, safety-critical, contractual, employment, or compliance use.