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odpowiedz:
a - pole I b - pole II c - pole III
(a + b + c) / 3 = 9 i 1/6 2a + 2b + 2c = 55
a = 3 i 2/3 = 11/3
b = 11/3 + 2,75 = 11/3 + 11/4 = 77/12
22/3 + 77/6 + 2c = 55
44 + 77 + 12c = 330 12c = 209 c = 17 i 5/12 (cm²)
proszę bardzo mam nadzieje że pomogłem