The curved line is called a “circumference.”
The circumference of a circle is the curve which bounds it.
Name a straight line that joins two points in the circumference.
It is called a “chord.”
A chord is a straight line that joins two points of a circumference.
Read six chords in the diagram.
Which two of these chords pass through the centre?
They are called “diameters.”
A diameter is a chord that passes through the centre.
Name a line that joins the centre with a point of the circumference.