Chapter 5 Understanding Elementary Shapes Ex. 5.8
Chapter 5 Understanding Elementary Shapes Ex. 5.8 Question 1. Examine whether the following are polygons. If any one among them is not, say why? Solution: (a) The given figure is not closed. Therefore, it is not a polygon. (b) The given figure is a polygon. (c) The given figure is not a polygon because every […]
Chapter 5 Understanding Elementary Shapes Ex. 5.7
Chapter 5 Understanding Elementary Shapes Ex. 5.7 Question 1. Say True or False: (a) Each angle of a rectangle is a right angle. (b) The opposite sides of a rectangle are equal in length. (c) The diagonals of a square are perpendicular to one another. (d) All the sides of a rhombus are of equal […]
Chapter 5 Understanding Elementary Shapes Ex. 5.6
Chapter 5 Understanding Elementary Shapes Ex. 5.6 Question 1. Name the types of following triangles: (а) Triangle with lengths of sides 7 cm, 8 cm and 9 cm. (b) ∆ABC with AB = 8.7 cm, AC = 7 cm and BC = 6 cm. (c) ∆PQR such that PQ = QR = PR = 5 […]
Chapter 5 Understanding Elementary Shapes Ex. 5.5
Chapter 5 Understanding Elementary Shapes Ex. 5.5 Question 1. 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 a letter ‘L’. (d) The letter V. Solution: (a) Yes, the adjacent edges of a table top […]
Chapter 5 Understanding Elementary Shapes Ex. 5.4
Chapter 5 Understanding Elementary Shapes Ex. 5.4 Question 1. What is the measure of (i) a right angle (ii) a straight angle? Solution: (i) Measure of a right angle = 90° (ii) Measure of a straight angle = 180° Question 2. Say True or False: (a) The measure of an acute angle < 90° (b) […]
Chapter 5 Understanding Elementary Shapes Ex. 5.3
Chapter 5 Understanding Elementary Shapes Ex. 5.3 Question 1. Match the following: (i) Straight angle (a) Less than one-fourth of a revolution. (ii) Right angle (b) More than half a revolution. (iii) Acute angle […]
Chapter 5 Understanding Elementary Shapes Ex. 5.2
Chapter 5 Understanding Elementary Shapes Ex. 5.2 Question 1. What fraction of a clockwise revolution does the hour hand of a clock turn through, when it goes from (a) 3 to 9 (b) 4 to 7 (c) 7 to 10 (d) 12 to 9 (e) 1 to 10 (f) 6 to 3 Solution: Question 2. […]
Chapter 5 Understanding Elementary Shapes Ex 5.1
Chapter 5 Understanding Elementary Shapes Ex 5.1 Question 1. What is the disadvantage in comparing line segment by metre observation? Solution: Comparing the lengths of two line segments simply by ‘observation’ may not be accurate. So we use divider to compare the length of the given line segments. Question 2. Why is it better to […]
Chapter 4 Basic Geometrical Ideas
Chapter 4 Basic Geometrical Ideas Very Short Answer Type Question 1. Draw a rough sketch of: (a) open curve (b) closed curve Solution: Question 5. Question 6. In the given figure, name all the possible triangles. Solution: Possible triangles are: (i) ∆ABC (ii) ∆ABD (iii) ∆ABE (iv) ∆ACD (a) ∆ACE (vi) ∆ADE Question 7. Name […]
Chapter 4 Basic Geometrical Ideas Ex 4.6
Chapter 4 Basic Geometrical Ideas Ex 4.6 Question 1. From the figure, identify: (a) the centre of circle (b) three radii (c) a diameter (d) a chord (e) two points in the interior Question 2. (a) Is every diameter of a circle also a chord? (b) Is every chord of a circle also a diameter? […]