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Cut the cake lengthwise and then crosswise. Stack the four pieces and then cut crosswise at one third the length and again at two-thirds the length. Done!
Half a sphere is a hemisphere or the shape of a ball cut in half.
Im not to sure if I get what you mean by this but i think that you mean that what shape can be cut in half evenly? If this is the case then it is any shape really unless it is irregular.
cut in half then cut both halves in half again
Cut it in half through its centre. Then cut each half into half. You will have four fourths.