Regular Pentagon Circumradius Calculator for layout notes, drafting, and classroom geometry when you want a fixed formula answer without improvising the math by hand.
Informational calculator only. Verify important outputs independently before legal, tax, medical, engineering, safety-critical, contractual, employment, or compliance use.
Enter job values, review the estimate, then use the decision hints before ordering or quoting.
circumradius = side / (2 x sin(pi / 5))This formula measures the distance from the center of a regular regular pentagon to any vertex.
All sides and interior angles should be equal for the formula to fit.