# Sides ratio

Calculate the circumference of a triangle with area 84 cm

^{2}if a:b:c = 10:17:21**Your answer:****Leave us a comment of example and its solution (i.e. if it is still somewhat unclear...):**

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Calculate the circumference of a triangle with area 84 cm^{2} if a:b:c = 10:17:21

**Your answer: **