What part of the whole circle is the sector f o h?
It is called a “quadrant.”
A quadrant is a sector which is one-fourth of a circle.
Read a sector which is greater than a quadrant.
If the chord e f be regarded a diameter, what do you call the semicircle below it?
If it be regarded as two radii, what is the semicircle called?
Then a semicircle is both a segment and a sector.
