Circumference of a rhombus

If you enlarge the side of the diamond by 4 cm, its circumference will be 20 cm. How long was the side of the original diamond?

Correct answer:

a =  1 cm

Step-by-step explanation:

o=4a  20=4 (a+4)  4a=4  a=44=1  a=1=1 cm



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