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= 1/2 x 140°
= 70°
Δ PQS sama kaki ⇒ ∠ PQS = 180° - 2 x 70°
= 180° - 140°
= 40°
∠ POS = 2 x ∠ PQS
= 2 x 40°
= 80°
∠ QRS = 1/2 (∠ POQ + ∠ POS)
= 1/2 (140° + 80°)
= 1/2 (220°)
= 110° ..... jawaban : C