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To find interior angle measurements, you must divide the shape into triangles by drawing diagonal lines. The diagonal lines draw triangles, and the interior angle measure of triangles are always 180 degrees. The sum of interior angles of an octagon is 1080 degrees. How ever many triangles you have, multiply it by 180. See octagons in the link for more help,
moro than 180
The interior angle measurements of a regular pentagon is 180-(360/5), or 108 degrees.
Assuming that the measurements refer to a rectangle, the diagonal would be sqrt(272 + 122) = sqrt(729 + 144) = sqrt(873) = 29.55 ft (to 2 dp)
Supplementary angles total 180 degrees.