How do you decide if the square cake tin 8 inches x 8 inches holds the same amount as a round 8 inch tin?

Answer 1

You compare the areas of their bases.

Find the area of the square cake tin by multiplying 8 x 8 to get square inches.

Find the area of a circle (the base of the round tin) by multiplying pi x radius x radius (The radius is 4 inches, half the diameter). For pi you can use 22/7 or 3.1415.

So the area of the circular tin is 4 x 4 x 3.1415.

Is that bigger or smaller than the square tin?

(You can also do it physically, because the round tin will just about fit INSIDE the square tin, so all the extra corners of the square tin will hold more cake! Yum!)