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42.5cm/20=2.125cm
37.5+37.5+2.125+37.5+2*2.125+37.5+3*2.125+37.5+4*2.125+37.5+5*2.125+37.5+6*2.125+37.5+7*2.125+37.5+8*2.125+37.5+9*2.125+37.5+10*2.125+37.5+11*2.125+37.5+12*2.125+37.5+13*2.125+37.5+14*2.125+37.5+15*2.125+37.5+16*2.125+37.5+17*2.125+37.5+18*2.125+37.5+19*2.125=20*37.5 +173*2.2.25=367.25cm
a₁₈=80
Sn=((a₁+an)/2)*n
S₁₈=117,5*9=1057,5
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