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r1 = 14m - 7m = 7m
P =P2 - P1 = pi*(r2)^2 - pi*(r1)^2= pi*( r2^2 - r1^2) = [ (14^2 - 7^2) * 22]/ 7 = [(196 - 49)*22]/7 =[147*22]/7 =3234 /7 = 462
Odp.Asfalt trzeba wylać na powierzchni 462 m^2.
Odpowiedź w 100% jest prawidłowa.