[
  "In isosceles triangle GHI, if ∠HGI = 24° is the vertex angle, the base angles are equal.",
  "In trapezium EFGH, EF is parallel to HG. Use co-interior angles: ∠FEH + ∠EHG = 180°.",
  "∠GHI = (180° − 24°) ÷ 2 = 78°. ∠EHG = 180° − 65° = 115°. Sum = 193°."
]