Rhombus sides

If you decrease the side of the rhombus by 30 mm, its circumference will be 70.8 mm. How long was the side of the original rhombus?

Correct answer:

a =  47.7 mm

Step-by-step explanation:

o=70.8 mm  4 (a30)=o 4 (a30)=70.8  4a=190.8  a=4190.8=47.7  a=10477=47.7=47.7 mm

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