Question

How do I calculate the circumference and area of a circle and the area of a sphere? These are skills that I need refreshing of. Thank you very much!

Answer 1

Circumference is `piD` where D is the diameter

Area is `pir^2` where r is the radius.

You can't find the area of a sphere a sit is 3D so it is the volume

Volume=`4/3pir^3` where r is the radius again.