Radius of the pan = 16cm
Formula for area of circle:
[tex]\boxed { \boxed { \text {Area of a circle =} \pi r^2}}[/tex]
Find the area of the pan:
[tex]\text {Area of the pan =} \pi (16)^2 = 804.25 \ cm^2[/tex]
[tex]\boxed { \boxed {\text {Answer : The butter must cover 804.25 cm}^2}}[/tex]
