Annulus from triangle

Calculate the content of the area bounded by a circle circumscribed and a circle inscribed by a triangle with sides a = 25mm, b = 29mm, c = 36mm

Correct result:

S =  831.0003 mm2

Solution:

a=25 mm b=29 mm c=36 mm  c1=a2+b2=252+292=1466 mm38.2884 mm c1c  s=a+b+c2=25+29+362=45 mm A=s (sa) (sb) (sc)=45 (4525) (4529) (4536)=360 mm2  R=a b c4 A=25 29 364 360=1458=18.125 mm  r=As=36045=8 mm  S1=π R2=3.1416 18.12521032.0623 mm2 S2=π r2=3.1416 82201.0619 mm2  S=S1S2=1032.0623201.0619=831.0003 mm2



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