# 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

Result

a =  1.8 cm
b =  0.8 cm

#### Solution:

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

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