Parallelogram

Calculate the unknown 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

Final Answer:

a =  1.8 cm
b =  0.8 cm

Step-by-step explanation:

$$\begin{gathered} o=7.2 \\ b=1.8 \\ o=2a+2b \\ a=o/2-b=7.2/2-1.8=1.8\text{cm} \end{gathered}$$

$$\begin{gathered} o=5.4 \\ a=1.9 \\ b=o/2-a=5.4/2-1.9=0.8\text{cm} \end{gathered}$$

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