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b=7cm
c=11cm
pp= a×b
pp=15×7
pp=105cm
pb1= a×c
pb1= 15×11
pb1= 165cm
pb2=b×c
pb2= 7×11
pb2=77
pc= 2×pp+2×pb1+2×pb2
pc= 210+330+154
pc=694cm
100%=694
15%=x
100x= 10410 //÷100
x=104,10
pc+x= wynik
694+104,10=798,1 cm kwadratowych
714 - 100%
X - 115%
x= (714*115)/100= 110670/100= 110,67cm