arc
A chord is the part of a circle defined by two endpoints.
The line passing through the center of a circle with two endpoints on the circle is the circle's diameter.
A chord is a line segment whose endpoints lie on a circle. A secant is a line (or line segment) that intersects a circle in two places, endpoints NOT on the circle.
An unbroken part of a circle consisting of two endpoints on the circle and all the points between them is called a "chord." The chord connects the two endpoints, and the arc formed by the endpoints on the circle is the corresponding arc of the chord. Together, they define a segment of the circle's circumference.
a chord
Semi-circle
Two lines tangent to a circle at the endpoints of its diameter are parallel. See related link for proof.
A line segment that has endpoints on a circle is called a chord. A chord connects two points on the circumference of the circle and divides the circle into two arcs. The longest chord in a circle is the diameter, which passes through the center of the circle.
A circle. has no endpoints.
It is a semicircular arc.
The segment that passes through the center of a circle and has endpoints on the circle is called a diameter. It is the longest chord of the circle and divides it into two equal halves. Every diameter is composed of two radii, extending from the center to the circle's circumference at each endpoint.
An arc is a part of a circle that is defined by its endpoints. It is a segment of the circumference of the circle.