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• Patterns and problems . • • • • Triangle angles • ~ 1cm sqU~red paperJ/

OJ Copy and complete these patterns.
I 2 m I +-
a 68,66,64,62,0,0,0. b 47,42,37,0,0,0. I
- ~"m
1
c 0,0,0,68,58,48. d 54,47,0,0,0,19.
e 81 , 72,0,0,0· f 77,0,0,0,57,52. I
Draw right angles on squared paper to m atch these.
o Write the number 6 less than each of these. a 2cm b 4cm
,0mf. l~m
a 17 d 61 e 80 '0:1
6cm

. f __ _ Sem

_ d ______ -J11cm
Scm
em 4em
a Ajit's bike costs £82. Paul's bike costs £7 less. o Measure and then draw these in the same way. d
Paul's bike costs £ __
a b
b Emma is 8 cm shorter than Ricky. Ricky is 95 cm toll.
Emma is cm tall.
c Carla's dad weighed 85 kg. He lost 9 kg in weight on his diet. il
Carlo's dod now weighs __ kg.
I1J Add one line to change each right angle into
CHALLENGE a right-angled triangle
··.··-IiI· An isosceles triangle has two sides of the same length. ~
If 74 + 5 = 79, then 79 - 5 = 74. m Beside each triangle, write isosceles or scalene
Make up more sentences like this using these numbers. / REMEMBER /\
~
A scalene triangle has no sides of the same length.

rn rn

a 68,66,64,62, 60, 58, 56 a 11 b 32 c 48 d 55 e 74 Practical: drawing right angles on squared a scalene
paper.
b 47,42,37, 32, 27, 22 b scalene
~ I
c Q8, 88, 78,68,58,48 c isosceles
a £75 b 87cm c 76kg
d 54,47, 40, 33, 26, 1Q d scalene
Practical: measuring lines and drawing right
e 81,72, 63, 54, 45 Challenge angles.

f 77, 72, 67, 62,57,52
If 38 + 7 = 45, then 45 - 7 = 38.
If 42 + 1 0 = 52, then 52 - 1 0 = 42.
Practical: adding one line to make right-angled
If 34 + 8 = 42, then 42 - 8 = 34. triangles.