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2a + 2b = 24dm
a = 2b
2*2b + 2b = 24dm
4b + 2b = 24dm
6b = 24dm / 6 (obie str. dziele przez 6)
b = 4dm
a= 2*4dm = 8dm
spr.
2*4dm + 2 * 8dm = 8dm + 16dm = 24dm
P = a * b
P = 8dm * 4dm = 32dm²
Odp. Boki mają dł. 8dm i 4dm. Pole wynosi 32dm²