# Parallelogram

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 =  0.8 cm

#### Solution:

$o=7.2 \ \\ b=1.8 \ \\ o=2a+2b \ \\ a=o/2 - b=7.2/2 - 1.8=\dfrac{ 9 }{ 5 }=1.8 \ \text{cm}$
$o=5.4 \ \\ a=1.9 \ \\ b=o/2 - a=5.4/2 - 1.9=\dfrac{ 4 }{ 5 }=0.8 \ \text{cm}$

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