Step-by-step explanation:
to calculate circumference:
[tex]2\pi \: r[/tex]
if the diameter is 16 then the radius would be 8.
[tex]2\pi \:r \\ = 2\pi(8) \\ = 16\pi \\ =Rationalize(50.26548245744) \\circumference = 50.27[/tex]
to calculate the area of a circle:
[tex]\pi {r}^{2} \\ = \pi( {8})^{2} \\ = Rationalize(201.06192982975) \\ area = 201.06 \: ^{2} [/tex]
