Give a definition for each of the following terms.
(a) parallel lines
(b)perpendicular lines
(c) radius of a circle
(d) square

Define the following terms: Parallel lines

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 (iii) line segment (iv) radius of a circle (v) square.

A variable triangle A B C is circumscribed about a fixed circle of unit radius. Side B C always touches the circle at D and has fixed direction. If B and C vary in such a way that (BD) (CD)=2, then locus of vertex A will be a straight line. (a)parallel to side BC (b)perpendicular to side BC (c)making an angle (pi/6) with BC (d) making an angle sin^(-1)(2/3) with B C

Give the biological terms for each of the following: The type of tissue that lines the respiratory tracts.

Consider the following figure and name: (a) A pair of parallel lines (b) Concurrent lines and point of concurrency ( c ) Three sets of collinear points (d) Six pairs of intersecting lines.

Which of the following has only 2 lines of symmetry? (a) Equilateral triangle (b) Rhombus (c) Circle (d) None of these

If each of the two lines is perpendicular to the same line, what kind of lines are they to each other?

A charge particle moves in a circle around an infinite line charge with the center of circle at the line and line being perpendicular to the plane of circle. Let r be the radius of circle. The velocity of the particle depends upon which power of r.

State which of the following statements are true (T) or which are false (F) If two lines in the same plane do not intersect, then they must be parallel. Distance between two parallel lines is not same everywhere. If m_|_l ,\ n\ _|_\ l and m\ !=n , then m n Two non-intersecting coplanar rays are parallel. No two parallel segments intersect. Every pair of lines is a pair of coplanar lines. Two lines perpendicular to the same line are parallel. A line perpendicular to one of two parallel lines is perpendicular to the other.

Which of the following are models for perpendicular lines :(a) The adjacent edges of a table top.(b) The lines of a railway track.(c) The line segments forming the letter ‘L’.(d) The letter V.