How many chords can be drawn through 21 points on a circle?

_____tangent can be drawn through a point on a circle.

If the angle between two tangents drawn from a point outside of a circle is 120° . The angle at the centre is

Find the number of diagonals that can be drawn the joining angular points of a Hexagon.

Find the number of diagonals that can be drawn the joining angular points of a Octagon.

Find the number of diagonals that can be drawn the joining angular points of a Heptagon.

Find the number of diagonals that can be drawn the joining angular points of a Decagon.

Find the number of diagonals that can be drawn the joining angular points of a Pentagoan.

If two tangents are drawn from an external point to a circle, what is the relation between the length of the tangents.

How many tangents can you draw on a circle.