Fill in the blanks

(a) Two lines intersecting at right angle are known as......
(b) If two segments do not intersect we......say that they are parallel.
(c) The perpendicular bisectors of the chords of a circle meet at.....

(a) Two lines intersecting at right angle are known as perpendicular lines.

(b) If two segments do not intersect we do not say that they are parallel.

(c) The perpendicular bisectors of the chords of a circle meet at centre.