In the below figure, the blue region represents a ______ and red represents a ______.
segment, sector
A region in the interior of a circle enclosed by a chord and an arc is called a segment of the circle. So, blue region is a segment.
A region in the interior of a circle enclosed by an arc on one side and a pair of radii on the other two sides is called a sector. So, red region is a sector.
Hence, blue region represent a segment and red region represent a sector.