Pentagon calculations

pentagone A pentagone is a polygon with five sides.
With this tool, you can compute area, R radius of circumscribed circle, t side, apothem r, circumference, diagonal d or height h of a regular convex pentagon.
You only enter one the values so that the other ones are computed.

α angle between the sides of a regular pentagon is 108° and the ratio between diagonal d and t side is equal to φ where φ is the golden ratio (1+√5)/2=1.6180339887...

area in m2
radius R in metre m
side t in metre m
apothem r in metre m
diagonal d (φt) in metre m
circumference 5t in metre m
height h (r+R) in metre m

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Keywords
polygon
pentagon
unit
area
surface
m2
metre
km2
square
radius
area