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2014-05-09T21:17:12+03:00
AΔ LDO= b*h/2= DH*OL/2  =80*24/2=  40*24=960 mm²
BN=LO=80

A BNLO=L*l= BL*BN= 27,3* 80= 2184 mm²

BN-d=2R= 80/2=40
A =πR²= 40²π= 1600π
π=3,14
A=1600*3,14=5024

Apiesei=960+2184+5024=8168 mm²