answersLogoWhite

0

How tob get a pentagons area?

User Avatar

Anonymous

12y ago
Updated: 8/20/2019
(Credits to Mathopenref.com)1. Given the length of a side.By definition, all sides of a regular polygon are equal in length. If you know the length of one of the sides, the area is given by the formula:



where
Sis the length of any side
Nis the number of sides
TANis the tangent function calculated indegrees
(seeTrigonometry Overview)Calculator

To see how this equation is derived, see

Derivation of regular polygon area formula.

2. Given the radius (circumradius)If you know the radius (distance from the center to a vertex, see figure above):


where
Ris the radius (circumradius)
Nis the number of sides
SINis the sine function calculated indegrees
(seeTrigonometry Overview)Calculator

To see how this equation is derived, see

Derivation of regular polygon area formula.

3. Given the apothem (inradius)If you know the

apothem, or inradius, (the perpendicular distance from center to a side. See figure above)

where
Ais the length of theapothem(inradius)
Nis the number of sides
TANis the tangent function calculated indegrees(seeTrigonometry Overview).Calculat

User Avatar

Wiki User

12y ago

What else can I help you with?