Will give the circumference of half of the circle.
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You need to know the radius first. Next you simply double the radius to get the diameter and then multiply that by pie and you have now worked out the circumference of your circle :)
4 to the second power is 16 and pie is always 3.14 so pie times radius so multiply 3.14 and 16 and that is your answer 50.24 answer
radius = 1, C=2(pie)r
you take the radius and multiply it by itself. then you multiply the radius squared by 3.14 to get the area of a circle...
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