find the angles marked with letters.
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Step-by-step explanation:
In ∆1,
through exterior angle property
e+e = 42+50+50
i.e. 2e = 142°
therefore,
e = 71°
In ∆2,
one of the angles = 88° (vertically opposite angles)
through angle sum property,
e+f+88° = 180°
71+f = 92
f = 21°