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q=12
P=p*q/2
P=16*12/2=96 [cm²]
p=a*h
h=12*0,8=9,6
96=a*9,6
a=9,6/96
a=10 cm
Obwód=10*4=40cm
d₁=16
d₂=12
h=12-0,2*12=12-2,4=9,6
P=½*d₁*d₂
P=½*16*12
P=96
P=a*h
96=a*9,6
a=96/9,6
a=10
Ob=4a
0b=4*10=40