Fill in all the parts of a circumference (7) on the board!
Arc, centre, chord, diameter, circumference, radius, semi-circumference
25
Define secant, tangent and external lines! You can draw them if it helps.
A secant line intersects the circumference at two points, a tangent line intersects the circumference at one point, and an external line never intersects
15
Which two circumferences have one common point on the line that joins their centers?
Exterior Tangent Circumferences and Interior Tangent Circumferences