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a=10
P=ah
40=10h
h=4
5=polowa podstawy
x=bok
4²+5²=x²
16+25=x²
x=√41
L=x+x+10=2√41+10
a=10cm
h=?
b=?
P=½ah
L=a+2b
½ah=40cm²
5cm*h=40cm²
h=40cm²/5cm
h=8cm
b=√((½a)²+h²)
b=√(25cm²+64cm²)
b=√(89cm²)
b=√(89)cm
L=10cm+√(89)cm+√(89)cm
L=(10+(2*√(89))cm
Albo wynik ma być taki chory, albo coś skaszaniłem, ale wątpię...