Answer :
∠ HCB = ∠CHE = 1200 (Alternate Interior angles)
∠ HCB + ∠ ABC = 1800 ( Co interior angles)
⇒ ∠ ABC = 600
∠ HCB = ∠CDE = 1200 (Corresponding angle)
∠ ABC = 600 and ∠CDE = 1200
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