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A line joining two points on a circle is called a chord. A chord is a straight line segment whose endpoints lie on the circle. The longest chord in a circle is called the diameter, which passes through the center of the circle. Chords play a significant role in geometry and trigonometry when studying circles and their properties.
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A line joining two points on the circle?
A secant line.
What do you call a straight line joining two points on an arc curve or circle?
A chord.
Is the radius of a circle a chord also?
No. A chord is a straight line joining two points on the circumference of a circle whereas a radius joins only one point on the circumference to the circle centre. A diameter is a straight line joining two points on the circumference (via the circle's centre) and so is also a chord. (Yes, but the question is about a radius, not a diameter!)
What is the locus of points equidistant from two points?
The perpendicular bisector of the straight line joining the two points.
A tangent line is a line that intersects a circle at exactly two points?
No. A tangent touches the circle at exactly one point. A line that intersects a circle at exactly two points is a secant.
