find the area of aregular octagon inscribed in a circle of radius 7.4cm

finding area of non right angle triangle
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For a regular polygon, with 8 sides, me set side leng=2 & got

Area=19.313708

& outside serkel radius=2.6131259

yu want outside rad=7.4, so 7.4/2.6131259=2.831857432

so tri side leng=2*2.83...=5.663714863

get poly area=154.884673, rim-leng=45.3097189

polygon hite=13.673417

alfa=45 deg, beta=67.5, inside angel=135, outside=45 deg
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