If it was an heptagon it would have 14 diagonals
A circle.
There is only one line (or line segment) that can be drawn between two distince points.
One
line segments
Seven.
66 ( 12 nCr 2 )
Such polygon is called a heptagon.
11, I believe.
Line segments with the same length are referred to as congruent line segments. They have identical lengths but may be oriented or positioned differently in space. When drawn on a plane, these segments can be compared using a ruler or by using mathematical notation to confirm their equality. Congruent segments are a fundamental concept in geometry, often used in proofs and constructions.
They can not be line segments on the same line, but they can both be line segments.
A square, a rectangle, a quadrilateral, or a trapezoid. (there's more, but I won't bore you)
twenty