the formula for the area of a circle is pi times r squared (sorry this website does not work today for presenting this better)
so 2826 = pi times r squared
so dividing through on both sides bi pi gives you:
2826 divided by pi = r squared
so r is the square root of (2826/ pi)
2826/pi = 899.5437384
so r is the square root of 899.5437384 = 29.99239468
r = 29.99 (to 2 decimal places)
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