PSLE GHJK is a rhombus. KMH and KLJN are straight lines.
- Find ∠GHK.
- Find ∠KJN.
- Find ∠KML.
(a)
∠GHK
= (180° - 104°) ÷ 2
= 38° (Isosceles triangle)
(b)
∠HJK
= ∠HGK
= 104° (Rhombus)
∠KJN
= 180° - 104°
= 76° (Angles on a straight line)
(c)
∠LHM
= ∠GHM
= 38° (Rhombus)
∠HLM
= 180° - 65°
= 115° (Angles on a straight line)
∠KML
= 38° + 115°
= 153° (Exterior angle of a triangle)
Answer(s): (a) 38° (b) 76° (c) 153°