Q1: Define the following terms:
(a) Line segment,
(b) Line,
(c) Intersecting lines,
(d) Parallel lines
Ans: (a) Line segment: A straight line drawn from any point to any other point is called as line segment.
(b) Line: Line is a straight path of points that goes on forever in two directions. It has infinite length, but no breadth and height.
(c) Intersecting lines: Interesting lines are lines that pass through the same point.
(d) Parallel lines: Parallel lines are never cross and always stay the same distance apart.
Q2: From the figure identify
(a) the centre of circle.
(b) three radii
(c) a diameter
Ans: (a) O is the centre of the circle.
(b) are three radii of the circle.
(c) is the diameter of the circle.
Q3: How many end points a line segment have?
Ans: 2
Q4: Classify the following curves as
Ans:
Q5: Fill up the following:
(a) ________ has no length, breadth, height or thickness.
(b) A line segment has a definite ___________.
(c) Curves that do not intersect themselves are called ___________ curves.
(d) An ‘angle’ is made up of ___________ rays having a common end point.
Ans: (a) Point
(b) length
(c) simple
(d) two
Q6: Radius of a circle is ________.
Ans: Radius is from the center of the circle to the circle’s edge. The diameter is edge to edge with the line going through the radius. Diameter is twice the length of the radius or 2r where r is the radius of the circle.
Q7: Point P is _____________.
Ans: Point P lies on the ray QP of the angle therefore P is on the angle.
Q8: Which of the pair of adjacent angles in the given figure?
Ans: Adjacent angles have a common side. In this figure side BC contain two angles which are angle B and angle C making them adjacent angles.
Q9: Write the points which are:
(a) in the minor sector OAPB
(b) minor segment ATB
(c) major sector OAQB
(d) major arc AQB
(e) minor arc APB
Ans: (a) U and N
(b) U
(c) D
(d) A, Q, S and B
(e) A, P, T and B
Q10: Illustrate, if possible, each one of the following with a rough diagram:
Ans:
Q11: Draw rough diagrams to illustrate the following :
Ans:
Q12: State true or false:
(a) A point indicates a definite position.
(b) A line segment is a part of a plane.
(c) A line is a set of points closely arranged.
(d) Two lines in a plane always intersect in a point.
Ans: (a) True
(b) False. A line segment is a part of a line that has two end points
(c) False. A line is a straight path that is endless
(d) False. Two lines in a plane intersect in a point or parallel.
Q13: Match the following:
Ans:
Q14: Measure of the two angles between hour and minute hands of a clock at 9 O’ clock are
Ans: 270^{∘}, 90^{∘}.
Q15: How many lines pass through one given point?
Ans: Through a sinlge point infinite number of lines can be passed by Euclid’s axiom.
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1. What are basic geometrical ideas? 
2. Why are basic geometrical ideas important? 
3. What are some examples of basic geometrical ideas? 
4. How can basic geometrical ideas be applied in reallife situations? 
5. How can one develop a better understanding of basic geometrical ideas? 

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