Find the value of x° and y° from the following figures:
Theorem 2:
If a side of a triangle is produced, the exterior angle so formed, is equal to the sum of the two interior angle.
∠ C = ∠ B (Alternate interior angles)
⇒ x° = 42°
In Δ CDE
Ext. ∠ E = ∠ C + ∠ D
⇒ 82° = 42° + y°
⇒ y° = 82° - 42°
⇒ y° = 40°
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