Area And Its Boundary Page 146 Whose Slice is Bigger? Suggest some ways to find out whose piece is bigger. Discuss. Method 1 Cut piece B into 3 pieces as shown in fig. Now put parts 1 and 2 over piece A as shown in fig. Parts 1 and 2 exactly cover piece A but […]
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Tenths And Hundredths Questions with (*) sign are open-ended questions. Page 134 What was the length of the smallest pencil you have used? Ans: The length of the smallest pencil that I used is 4 cm. How long is this pencil? Guess 3 cm Measure it using a scale. How good is your guess? Ans:
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Boxes And Sketches Page 126 Ramya made four more shapes. Each is to be folded along the dotted lines. You have to find out which of these can be made into a box. Ans: (a) and (c) can be made into box. Page 127 Shapes that Fold into a Cube 1). Buddha wants to make a
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Mapping Your Way Click here for the solutions of 1). The Fish Tale 2). Shapes and Angles 3). How Many Squares? 4). Parts and Wholes 5). Does It Look The Same? 6). Be My multiple, I’ll Be Your Factor 7). Can You See The Pattern 8). Mapping Your Way? 9). Boxes And Sketches 10).
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Congruence of Triangles Exercise 7.2 1). Which congruence criterion do you use in the following? (a) Given: AC = DF AB = DE BC = EF So, DABC @ DDEF Ans: DABC @ DDEF by SSS rule (b) Given: ZX = RP RQ = ZY ÐPRQ = ÐXZY So, DPQR @ DXYZ Ans: DPQR @
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Congruence of Triangles Exercise 7.1 1). Complete the following statements: (a) Two line segments are congruent if they have the same length. (b) Among two congruent angles, one has a measure of 70°; the measure of the other angle is 70°. (c) When we write ÐA = ÐB, we actually mean mÐA = mÐB.
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Integers Exercise 6.3 1). Find (a) 35 – (20) (b) 72 – (90) (c) (– 15) – (– 18) (d) (–20) – (13) (e) 23 – (– 12) (f) (–32) – (– 40) Answer: (a) 35 – (20) 35 – (20) = 35 – 20 = 15 (b) 72
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Integers Exercise 6.2 1). Using the number line write the integer which is: (a) 3 more than 5 Ans: 8. (b) 5 more than –5 Ans: 0. (c) 6 less than 2 Ans: -4. (d) 3 less than –2 Ans: -5. 2). Use number line and add the following integers: (a) 9 + (– 6) Ans: 9 +
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Integers Points to remember: (a) Every positive integer is larger than every negative integer. (b) Zero is less than every positive integer. (c) Zero is larger than every negative integer. (d) Zero is neither a negative integer nor a positive integer. (e) Farther a number from zero on the right, larger is its value.
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The Triangle and Its Properties Exercise 6.5 1). PQR is a triangle, right-angled at P. If PQ = 10cm and PR = 24 cm, find QR. In DPQR, By Pythagorean Property QR2 = PQ2 + PR2 QR2 = 102 + 242 QR2 = 100 + 576 QR2 = 676 Taking square root on both sides
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