Calculate the missing side of a parallelogram, if you know the perimeter o and one side:

a) o = 7.2 cm; b = 1.8 cm
b) o = 5.4 cm; a = 1.9 cm

Correct result:

a =  1.8 cm
b =  0.9 cm


o=7.2 b=1.8 o=2a+2b a=o/2b=7.2/21.8=95=95 cm=1.8 cm
o=5.4 a=1.9 b=o/2a=5.4/21.9=910=910 cm=0.9 cm

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