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2²+y²=4²
4+y²=16
y²=16-4
y²=12
y=√12=2√3
Pp=½*(10+6)*2√3
Pp=16√3
Pb₁=2*4*20=160
Pb₂=6*20=120
Pb₃=10*20=200
Pb=160+120+200=480
Pc=2*16√3+480
Pc=32√3+480
b)Obliczam bok rombu
6²+8²=x²
36+64=x²
100=x²
10=x
Pp=½*12*16
Pp=96
Pb=10*20*4=800
Pc=2*96+800
Pc=192+800=992