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a=x
b=80%x=0.8x
a²+b²=c²
x²+(0.8x)²=√41²
x²+0.64x²=41
1.64x²=41
x²=41÷1.64
x²=25
x=√25
x=5 cm
a=5 cm
b=0.8×5=4 cm
Ob=2a+2b
Ob=2×5+2×4
Ob=10+8
Ob=18 cm
ja bym tak to zrobiła...