a) The diagonal is the length of the diameter of the circle. Use the area to find the diameter.
b) Knowing the length of the diagonal, use Pythagoras' theorem to determine the length of one side.
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For both a) and b), I'm not sure what to do.
a) It is asking for the length of the diagonal and we are given a formula, A of circle = 38pi m^2
Half of the circle = diagonal
So, should I just divide that formula by 2 and make it into a radical? How do I turn it into a radical if it becomes a decimal number (because of the pi)?
b) I have no clue.