Page 349 - Start Up Mathematics_7

Values and Life Skills

1. 800 m; 400 m 2. 21 dm
1 (c)
3. 346 m 2 4. (a) ` 2,880 (b) ` 25,200
2
5. ` 1762.50
Exemplar Problems

1. d 2. c 3. base 4. False 2.

5. 31.43 m (approx.), 75.43 m (approx.)
2
6. Area in both cases is 86 cm 2
7. 55 cm 2
Oblique sketch Isometric sketch
Chapter 15

Exercise 15.1
1. (a) white board marker, a pencil cell 3. (a) (b)
(b) a funnel, an icecream cone
(c) a chalk box, a rubix cube
(d) a marble, a soccer ball
2. (a) (v) (b) (i) (c) (ii) (d) (iv) (e) (iii) 4. (a) (b)
Exercise 15.2
1. Face (F) 6 6 9 7
Edges (E) 12 9 21 15
Vertices (V) 8 5 14 10
F + V – E 2 2 2 2
5.
2. (d) and (e) 3. (a) and (d) 4. (a) Yes (b) No
5. (a) (iii) ; (b) (v) ; (c) (iv) ; (d) (ii) ; (e) (i)

1 1 Exercise 15.4
6. (a) 2 3 5 4 (b) 3 2 4 5 1. Vertical cut Horizontal cut
6 6 (a) Circle Circle
(b) Rectangle Rectangle
1 4 (c) Rectangle Circle
(c) 2 6 (d) Square Square
3 5 (e) Trapezium Circle

(f) Triangle Square
7. 2. Figure (1) (2) (3)
(a) Front (or top) Side Top (or front)

(Note: Answers may vary) (b) Top Side Front
8. (b) and (c) (c) Front (or side) Side (or front) Top
Exercise 15.3 (d) Top Side Front
1. Three different isometric sketches are

3. (d) 4.
(a) (b)
5. (a) Circle (b) Circle (c) Circle (d) Square

6. (a) 24 cubes (b) 9 cubes

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