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An outside circular ring has a circumference of 90 cm. What is the circumference of an inner ring which is 8 cm shorter in radius? Both circles have the same center. i came to 39.8but im barley learning this so just making sure if its wrong don't need to explain just say its wrong thx

Mathematics
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\[{\large{perimeter = 2\times{pie}\times{r}}}\]
@sheg means perimeter of circle. :D And one latex tip to write pi. Write as \pi

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@shivam_bhalla thanks a ton buddy
oqei thx
Your approach towards the problem must be to find the radius of outer circle using the formula given by @sheg and then......... @sheg , welcome :)

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