Hey!
The formula for circumference is 2·pi·r
r = radius pi = 3.14
So to find the circumference of this circle, divide the diameter by 2 to get the radius (5). Then plug it in.
2·pi·5 = 31.42 or 10 pi
The circumference of the circle equals 31.42 cm or 10 pi cm
Next the formula for the area of a circle is pi · r²
pi = 3.14 r = radius
So to find the area of this circle, divide the diameter by 2 to get the radius (5). Then plug it in.
pi · 5² = 78.54 or 25 pi cm²
The area of the circle equals 78.54 cm² or 25 pi cm²
(C = 10 pi and A = 25 pi cm² would be considered leaving answers in terms of pi)
Hope this helps :)
