Page 222 - Start Up Mathematics_4

Chapter 12: Basic Geometry (e) 16 cm (f) 22 cm (g) 24 cm (h) 30 cm
Exercise (i) 40 cm (j) 44 cm
4. (a) 6 cm (b) 7 cm (c) 9 cm (d) 12 cm
1. (a) AB (b) CD (c) PQ (d) RS
(e) 15 cm (f) 16 cm (g) 19 cm (h) 21 cm
2. (a) XY (b) KL (c) LM (d) PQ
3. (a) ray (b) line segment (c) line (i) 25 cm (j) 27 cm
5. Students to do on their own.
4. (b) YZ or ZY (c) ST or TS (d) DE or ED Exercise 13.2
5. 1. (a) (ii) (b) (iv) (c) (i) (d) (iii)
6. Students to do on their own. 2. (a) (i) front (ii) side (iii) top

7. (a) ∠POQ — acute angle (b) ∠AED — right angle (b) (i) side (ii) top (iii) front
(c) ∠SOT — obtuse angle (d) ∠KLM — right angle (c) (i) front (ii) side (iii) top
(e) ∠XYZ — acute angle (f) ∠PQR — straight angle (d) (i) front (ii) top (iii) side

Scratch Your Brain Exercise 13.3
1. Students to do on their own.
(a) Number of angles = 3 2. (a) (ii) (b) (i) (c) (ii)
∠ABC = right angle, ∠ACB = acute angle,
∠BAC = acute angle Exercise 13.4
(b) Number of angles = 3 1. (a) 20 cm (b) 11 cm (c) 8 cm
∠ABC = obtuse angle, ∠BAC = acute angle, (d) 17 cm (e) 13 cm (f) 20 cm
∠ACB = acute angle 2. Students to do on their own.

(c) Number of angles = 3 3. (a) 17 cm (b) 60 cm (c) 8 cm
∠ABC = acute angle, ∠BAC = acute angle,
∠ACB = acute angle (d) 4 cm (e) 20 cm (f) 4 cm
4. (a) 64 cm (b) 48 cm (c) 100 cm
Chapter 13: Shapes and Patterns
(d) 172 cm (e) 368 cm
Let’s Recall 5. (a) 80 cm (b) 92 cm (c) 218 m
1. (a) Faces = 1, edges = 0, corners = 0 6. (a) 24 cm (b) 28 cm (c) 26 cm (d) 20 cm
(b) Faces = 6, edges = 12, corners = 8
(c) Faces = 1, edges = 2, corner = 1 7. (a) 96 cm (b) 2040 m (c) 43 km 150 m
Exercise 13.5
2. (a) (b)
1. (a) (b) (c)

(c) 800, 820, 840, 860, 880 2. (a) (b) (c)
(d) D20, E25, F30, G35, H40
(e) Gh, Ij, Kl, Mn, Op
(f) 666, 555, 444, 333, 222 (d) (e) (f)

3. (a) (b) (c) (g) (h) (i)

Exercise 13.6
4. (a) and (b)
1. (a) (b) (c)
Exercise 13.1
1. (a) (iii) (b) (i) (c) (iii) (d) (iii)
2. (a) CP, CL, CM (b) LM, XY (c) LM (d) C (d) (e) (f)
3. (a) 4 cm (b) 6 cm (c) 10 cm (d) 14 cm

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