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a - podstawa = 12 dm
h = 0,75 razy 12 = 9 dm
P - pole = ah/2 = 12 razy 9/2 = 6 razy 9 = 54 dm²
x=16
P=1/2× 12×16=96
75% = 9dm
a = 12dm
h = 9dm
p=( 12 × 9 dm ) : 2
p= 108dm : 2
p = 54dm