when a piece of a circle is determined by two radii, that piece is best called a
A sector
B circumference
C remainder
D chord
Since the answer is supposed to be a "piece" (portion)of a circle, I would go with A. sector -- It is the "piece of the pie" intercepted by the two radii.
a.sector
The best answer is A) sector.
To understand why, let's break down the options:
A) Sector: A sector of a circle is a region enclosed by two radii of the circle and the corresponding arc between them. When you divide a circle into different sections using two radii, each section is called a sector.
B) Circumference: The circumference of a circle refers to the distance around the outer edge of the circle. It is the total length of the boundary of the circle, which is equivalent to the perimeter of other shapes.
C) Remainder: In mathematics, the term "remainder" typically refers to the positive integer left over when one integer is divided by another. It is not applicable in the context of describing a piece of a circle defined by two radii.
D) Chord: A chord is a line segment that connects two points on the circumference of a circle. It does not necessarily have to be defined by radii. While a sector is determined by two radii, a chord is determined by two points on the circumference of the circle.
Therefore, the correct answer is A) sector, as the term best describes a specific piece of a circle defined by two radii and the corresponding arc.