Circumference is the curve (boundary): all points at the same distance from the center.
A disk is the part of the plane inside that boundary including the boundary itself.
If a whole (for example a disk or a rectangle) is cut into equal pieces, each piece is a part (a fractional part of the whole). One of two equal parts is a half, one of three is a third, one of four is a fourth (a quarter).
Important: you may compare parts only for the same whole or for equal wholes.
Circumference — boundary; disk — inside that boundary
A part is one of equal pieces of a whole
Half, third, quarter — special cases
The pieces must be equal
Name the fraction from the shaded part
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