Posted by **rebecca** on Saturday, May 4, 2013 at 8:35pm.

Find the area of the regular polygon. Round your answer to the nearest tenth.

the individual sides are 10 the radius is 13.07

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**Damon**, Saturday, May 4, 2013 at 8:38pm
radius to what where with center where?

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**rebecca**, Saturday, May 4, 2013 at 8:47pm
the 10 is on one of the lines of the polygon then a line from the center

goes from the center to the edge of polygon inside with a doted line

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**rebecca**, Saturday, May 4, 2013 at 8:56pm
does that help

please help me with this

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**Ms. Sue**, Saturday, May 4, 2013 at 8:59pm
http://www.mathsisfun.com/geometry/regular-polygons.html

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**Damon**, Saturday, May 4, 2013 at 9:00pm
If your radius is to the corners, then

10 = 2* 13.07 sin (180/n)

sin (180/n) = .382555

180/n = 22.5

n = 8 sides

360/8 = 45 = top angle of each isoceles triangle

half of that has hpotenuse of 13.07 and base of 5

area of each of those 16 triangles = (1/2) (5)(13.07 cos 22.5) = 30.2

16*30.2 = 483

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**rebecca**, Saturday, May 4, 2013 at 9:03pm
thank you

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**Damon**, Saturday, May 4, 2013 at 9:08pm
If your radius is to the center of each side then

tan (360/2n) = 5/13.07

180/n = 20.93

n = 8.59 sides

I doubt if that is what it means so use my previous answer.

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