The area of a circle is 18.31cm2. find the length of the radius rounded to 2 dp.
1 answer:
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A^2 = b^2 + c^2 -2bc * cos(A)
a^2 = 144 + 225 -360 * .5
a^2 = 189
a = 13.748
a^2 = 144 + 225 -360 * .5
a^2 = 189
a = 13.748