Find the area of a circle with a circumference of \blueD{12.56}12.56start color #11accd, 12, point, 56, end color #11accd units.
Answers
Answer:
The formula for circumference of a circle with radius r is 2πr.
The formula for the area of a circle with radius r is πr2.
π≈3.14
So the radius of our circle is 6.282π≈6.282⋅3.14=1
and its area is πr2≈3.14⋅12=3.14
The number π is defined as the ratio of the circumference of a circle to its diameter (i.e. to twice its radius), hence the formula 2πr.
To see that the area of a circle is πr2 you can divide it into a number of equal segments and stack them head to tail to form a sort of parallelogram with 'bumpy' sides. the long sides will be about half the circumference in length - that is πr, while the height of the parallelogram will be about r. So the area is seen to be be about πr2.
Answer:
its 12.56
Step-by-step explanation:
12.56 divided by 3.14, divide by 2, multiply by itself, mutiply by 3.14, that + 12.56
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