S. K. Gupta Anubhuti Gangal Class 5 Math Tenth Chapter Basics Of Geometry Exercise 39
Point: A point is an exact location in space.
Line: A line is a straight path of points that extends on and on in both the directions without ever ending.
Line Segment: A part of a line is called a line segment.
Ray: A ray is a straight path that has one endpoint and goes on and on in one direction.
Plane: A plane is a flat surface.
Angles: An angle is a figure formed by two rays meeting at a common endpoint.
Interior Angle: The inside of an angle that is the region between the rays is called the interior of the angle.
Exterior Angle: The points of the plane that do not lie on the arms or in the interior of the angle are in the exterior of the angle.
Degree: The standard unit of measure for angles is the degree.
Protractor: The instrument for measuring angles is called a protractor.
(1) Which of the following has a fixed length?
(a) A line
(b) A ray
(c) A line segment
(d) A point
Ans: (c) A line segment
(2) Classify as rays, lines and line segments. Also, name them.
(3) State True (T) or False (F).
(a) A ray has a define length. = False
(b) A line cannot be drawn on a piece of paper = True
(c) A ray has one endpoint = True
(d) A line segment has no endpoints = False
(e) A plane has fixed boundary = False
(4) Count and name the line segments in each of the following figures.
Ans: (a) 8; AB, BC, CD, DE, EF, FG, GH, HA
(b) 12; AB, BC, CD, DE, EF, FG, GH, HI, IJ, JK, KL, LA
(c) 6; AB, BC, CD, DE, EF, FA
(5) Name the rays, and line segments in the following figures.