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a= 20
d =?
b=?
c=13
h=12
Szukane:
P=?
b=?
d=?
Rozwiazanie:
d^2= 13^2 - 12^2
d^2=169 - 144
d^2= 25
d=5
b= 20 - 5*2
b=10
P= ((a+b)*h)/2
p= ( 30*12)/2
p=180