PSLE GHJK is a trapezium with GH parallel to KJ. GMH and LMK are straight lines and GL = LH. ∠LGK = 98°.
- Find ∠GKM.
- Find ∠HLM.
(a)
∠GKM
= 180° - 98° - 21°
= 61° (Angles sum of triangle)
(b)
∠GMK
= 67° (Alternate angles)
∠HGL
= 67° - 21°
= 46° (Exterior angle of a triangle)
∠HLM
= 180° - 46° - 46° - 21°
= 67° (Angles sum of triangle)
Answer(s): (a) 61°; (b) 67°