On sait que :
*AT=UN=RS
*MT=OP=CS
*MO=TP
*TU=AN
*US=NR
1)
=
AireMTPO+AireUNRS
= (MTxMO) + (UNxNR)
= (3.2x2) +
(7x3.4)
= 6.4 + 23.8
= 30.2cm²
2)
AireMARC
= (MT+AT) x AR
= (3.2+7) x 5
= 22.4 x 5
= 112 cm²
3)
AireCOPS
= CS x (MC–MO)
= 3.2 x (5-2)
= 3.2 x 3
= 9.6cm²
