Understanding Engineering Mathematics

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C.For (i) and (ii) determine the lettered anglesa,b,c,d,e. Equal arrows denote parallel
lines.


60 °

b
c

a

(i)

85 °

a

e d

b
c

(ii)

Figure 5.2


5.1.3 Triangles and their elementary properties ➤150 160➤➤


Determine the lettered angles. Crossbars on lines denote that they have equal length.


60 °

70 °

ab
(i)

65 ° a

b

c
(ii)

Figure 5.3


5.1.4 Congruent triangles ➤152 161➤➤


For each of (i), (ii) state whether the pair of triangles is congruent. Equal angle arcs denote
equal angles.


C

B
A

D
(ii)

C

A B

D
(i)

Figure 5.4

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