Area of a circle

I have a recipe to make a 9 inch cheese cake. Usually, people do not eat a lot of cheese cake due to the cheesiness of the cake and I always left with half cut cake, which is not as nice or presentable.

I wanted to make 2 smaller cakes out of the recipe so that I can bring one to a friend’s house and one for afternoon tea with guests at home. But I’m not sure what cake tray dimension that I should use.

I goggled on the website and found this MathGoodies which is very useful.

A = Pi. r. r

Area of a circle = 3.14 x Radius x Radius, where radius is half the length of the diameter of a circle (Radius = Diameter / 2)

Area of a 10 inch cake tray = 3.14 x 5.0 x 5.0 = 78.5 inch2

Area of a 9 inch cake tray = 3.14 x 4.5 x 4.5 = 63.6 inch2

Area of a 8 inch cake tray = 3.14 x 4.0 x 4.0 = 50.2 inch2

Area of a 6 inch cake tray = 3.14 x 3.0 x 3.0 = 28.3 inch2

Yeah, now I can have 2 mini cakes for 2 different functions. It’s much nicer and presentable than having a half cut cake.