Anna, you shouldn't have trouble with these. Please make sure that
you understand my answers, or ask your teacher or parent to sit down
with you for a few minutes and go over them.
-- The radius of a circle is a line from the center to the curved part.
-- The diameter of a circle is a line all the way across the circle,
going through the center.
-- The radius is half of the length of the diameter.
-- The diameter is double the length of the radius.
-- A chord of a circle is any line that connects two points on the circle.
The longest possible chord is one that goes through the center.
Then it's a diameter of the circle.
