Question

(i) parallel lines

(ii) perpendicular lines

(iii) line segment

(iv) radius of a circle

(v) square

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Solution

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(ii) Perpendicular lines - Two lines $AB$ and $CD$ lying the same plane are said to be perpendicular, if they form a right angle. We write $AB⊥CD$

(iii) Line segment - A line-segment is a part of line. When two distinct points, say $A$ and $B$ on a line are given, then the part of this line with end-points $A$ and $B$ is called the line-segment.

(iv) Radius of a circle - The distance from the centre to a point on the circle is called the radius of the circle. In the following figure $OP$ is the radius.

(v) Square - A quadrilateral in which all the four angles are right angles and four sides are equal is called a square. $ABCD$ is a square.

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