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2przekątna=x+20%x=100%x+20%x=120%x=1,2x
½*x*1,2x=0,6x²
1podstawa=a
2podstawa=a-40%a=60%a=0,6a
h=2a
P=½*(a+0,6a)*2a
P=½*1,6a*2a
P=1,6a²