Posted by Anne on Monday, December 5, 2011 at 11:54am.
8 sides, so each side = 12.5 ft
split the octogon into 8 isosceles triangles.
Consider one triangle, the central angle is 360/8 = 45°, so each base angle = 67.5°
tan 67.5 = height/6.25
height = 6.25(tan67.5) = 15.0888...
area of one triangle = (1/2)(12.5)(15.0888..)
= 94.3052..
area of whole thing =8(94.3052..) = 754.4417
check my arithmetic, I had my calculator keep all the digits as I went along
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