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the formula is pi times r squared pi = 3.14 r = 3 3 squared = 9 so its 3.14 times 9
The formula for volume is 1/3 Bh ( 1/3 pi times radius squared times the height.) The formula for surface area is 2 pi r h plus 2 pi r squared.
Cone: 1/3 ( pi r squared h). sphere: 4/3 pi r cubed
That is the formula for the area of a circle; r refers to the radius, and pi is approximately 3.14. r squared means that you multiply r x r.
The area of a circle = pi*r2