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przekątna f= 1/2 x
x+1/2x=60dm
1,5x=60dm
x=40dm
przekątna e= 40dm
przekątna f= 20dm
P=e*f/2
P= 40*20/2
P=400dm²
Pr = ?
Pr = ½(ef)
e = ½f
½f + f = 60dm
1½f = 60dm |:(1½)
f = 40dm
e = ½f
e = ½*40
e = 20dm
Pr = ½(40*20)
Pr = ½*800
Pr = 400dm²