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Mathematics 18 Online
OpenStudy (anonymous):

Explain how the formula for the area of a regular polygon is derived from that of a triangle.

OpenStudy (jack1):

|dw:1372681363067:dw|

OpenStudy (jack1):

|dw:1372681413417:dw|

OpenStudy (jack1):

do u understand about arcs from interior angles of a circle...?

OpenStudy (jack1):

|dw:1372681571178:dw|

OpenStudy (jack1):

are u even there dude...? @lashon20

OpenStudy (anonymous):

yea my bad im here

OpenStudy (jack1):

cool, so area of polygon = [ (s^2) * n ]/ 4 * tan (180/n)

OpenStudy (jack1):

s = side length n = number of sides

OpenStudy (anonymous):

thanks for the help

OpenStudy (jack1):

haven finished yet dude...

OpenStudy (anonymous):

yea

OpenStudy (jack1):

so dude, if the polygon was 3 sided, the angle coming out from the center would be 360/n for the apex of each triangle = 360/3 for a triangle = 120 degrees |dw:1372687749440:dw|

OpenStudy (jack1):

|dw:1372687807748:dw|

OpenStudy (jack1):

so area of this little triangle (with an apex of 120 degrees) Area = 1/2 x base x height as base of this triangle = side length of polygon Area = 1/2 x side length x height and height = ...? |dw:1372688108157:dw|

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