2. Give a definition for each of the following terms. Are there other terms that .need to be defined first? What are they, and how might you define them? (i) Parallel lines (ii) Perpendicular lines 54 (iii) Line segment (iv) Radius of a circ'le (v) Square

(i) Lines which do not meet at a point when produced bo sides; lines, intersecting lines. (ii) If angle between two given lines is 90°; lines,. angle between lines. (iii) A part of a line; two given poin, line. (iv) Constant distance from any point on the boundary of a circle to the centre of the circle; centre, boundary. (v) A closed figure of four sides where all the sides are equal and diagonals are equal; points, line segments.