Understanding Engineering Mathematics

B. Determine all the angles in triangles with the following angles and opposite external
angles respectively

(i) 25°, 114° (ii) 63°,80° (iii) 45°,65° (iv) 27°, 115°

C. (i) Find anglesa,b,c,d:

120 °acd

b

(ii) Finda,b,c,d,e,f:

62 ° fe

d

ab c

5.3.4 Congruent triangles

➤➤

144 152

➤

Identify, where possible, a pair of congruent triangles:

C

C

C

A

A

A

B

B

B

(i)

(iii) (iv)

(ii)

D

D

D