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P= 2.5 * 12
P= 30
b=2*4=8
h=1 i1/4*4=5
Ptr=(a+b)2*h
Ptr=(4+8)/2*5
Ptr=112/2*5
Ptr=6*5
Ptr=30cm²
Wysokość: 4*1 1/4=4*5/4=5
Pole trapezu=[(a+b):2]*h=[(4+8):2]*5=(12:2)*5=6*5=30
Odp. Pole trapezu wynosi 30.