Basic Geometrical Ideas Exercise 4.3 1). Name the angles in the given figure. Angles in the given figure are ∟DAB, ∟ABC, ∟BCD, and ∟CDA 2). In the given diagram, name the point(s). (a). In the interior of ∟DOE Point A (b). In the exterior of ∟EOF Point A, C, …
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Basic Geometrical Ideas Exercise 4.2 1). Classify the following curves as (i) open or (ii) Closed (a). Open (b). Closed (c). Open (d). Closed (e). Closed 2). Draw rough diagrams to illustrate the following. (a). Open curve (b). Closed curve 3). Draw any polygon and shade it’s interior. 4). Consider the given figure and …
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Basic Geometrical Ideas Exercise 4.1 1). Use the figure to name a). Five points b). A line c). Four rays d). Five line segments Answer: a). Five points B, O, E, D, C. b). A line There are many possible answers. For example line DE, line DB, line DO, line EB, etc. …
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Playing with Numbers Exercise 3.7 1). Find the HCF of the following numbers: 1). Renu purchases two bags of fertilizer of weights 75 kg and 69 kg. Find the maximum value of weight which can measure the weight of the fertilizer exact number of times. 2). Three boys step off together from the same …
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Playing with Numbers Exercise 3.6 1). Find the HCF of the following numbers: a). 18, 48 b). 30, 42 c). 18, 60 d). 27, 63 e). 36, 84 f). 34, 102 g). 70, 105, 175 h) 91, 112, 49 i). 18, 54, 81 j). 12, 45, 75 Answer: a). 18, 48 Factors of 18 …
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Playing with Numbers Exercise 3.5 1). Which of the following statements are true? (a) If a number is divisible by 3, it must be divisible by 9. (b) If a number is divisible by 9, it must be divisible by 3. (c) A number is divisible by 18 if it is divisible by …
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Playing with Numbers Exercise 3.4 1). Find the common factors of : (a) 20 and 28 Factors of 20 = 1, 2, 4, 5, 10, 20 Factors of 28 = 1, 2, 4, 7, 14, 28 Common factors = 1, 2, 4 (b) 15 and 25 Factors of 15 = 1, 3, 5, 15 Factors …
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Playing with Numbers Exercise 3.3 1). Using divisibility tests, determine which of the following numbers are divisible by 2; by 3; by 4; by 5; by 6; by 8; by 9; by 10 ; by 11 (say, yes or no): Number 2 3 4 5 6 8 9 10 11 128 990 1586 …
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Playing with Numbers Exercise 3.2 Properties of Whole Numbers: 1). What is the sum of any two a). odd numbers b). even numbers Answer: 1a). The sum of any two odd numbers is always an even number. 1b). The sum of any two even numbers is always an even number. 2). State …
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Playing with Numbers Exercise 3.1 1). Write all the factors of the following numbers: a). 24 b). 15 c). 21 d). 27 e). 12 f). 20 g). 18 h). 23 i). 36 Answers: a). 24 24= 1 X 24 24 = 2 X 12 24 = 3 X 8 24 = 4 …
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