Understanding Engineering Mathematics

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