How_To_Be_Good_At_Math

320 ANSWERS

Geometry

p207 There are nine diagonals:

p209 The dotted lines show parallel lines:

p213 Shape 1 is the regular polygon.

p215

p217 You would get a parallelogram.

p221 The diameter is 6 cm. The

circumference is 18.84 cm.

p223 The shape has 8 faces, 18 edges,

and 12 vertices.

p227 Shape 4 is a non-prism.

p228 The other nets of a cube are:

p237 a = 90°, b = 50°, c and e = 40°

p239 1) 30° 2) 60°

p241 Each angle is 70°

p243 1) 60° 2) 34° 3) 38° 4) 55°

p247 115°

p248 A = (1,3) B = (4,7)

C = (6,4) D = (8,6)

p251 1) (2, 0), (1, 3), (−3, 3), (−4, 0),

(−3, −3), (1, −3).

2) You would make this shape:

p253 1) Orange monorail car

2) Boat no. 2 3) C7

p255 1) 2W, 2N, 3W

2) One route is: 2E, 8N, 1E

3) The beach 4) Seal Island

p257 The numbers 7 and 6 have none,

3 has one, and 8 has two.

p258 No. 3 has no rotational symmetry.

p261

p265 There are five other positions

the triangle could be in:

Statistics

p277 1) 133 2) 7 3) 19

p283 One of several possible pictograms

looks like this:

p293 1) 155 ̊ 2) 20%

p299 1) 7 2) 2 and 12 3) 1 / 6 and^1 / 36

Algebra

p305 1) 32 2) 7 3) 53 4) 21

p307 1) 44, 50, 56, 62, 68 2) (6 × 40) + 2

= 242 3) (6 × 100) + 2 = 602

Dorling Kindersley would like to thank:

Thomas Booth for editorial assistance;

Angeles Gavira-Guerrero, Martyn Page,

Lili Bryant, Andy Szudek, Rob Houston,

Michael Duffy, Michelle Baxter, Clare

Joyce, Alex Lloyd, and Paul Drislane

for editorial and design work on early

versions of this book; Kerstin Schlieker

for editorial advice; and Iona Frances,

Jack Whyte, and Hannah Woosnam-

Savage for help with testing.

Acknowledgments

Equilateral triangle

Right-angled triangle Isosceles

triangle

Scalene

triangle

1

2

3

-1

-2

-3

-2-3-4 -1 0 1 2

Leroy’s gaming

Day Gaming time

Monday

Tuesday

Wednesday

Thursday

Friday

10 minutes

KEY

319-320_Maths_Answers.indd 320 11/03/2016 16:24