Algebra-Triangle Mix
Geometry
Level
2
Find the answer.it is easy. α + β = ? degrees.
The answer is 70.
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1 solution
∠CDF = 180° - 125° = 55° ∠DFC = β + 55° (Using Exterior angle Property) ∠CDF + ∠DFC + ∠DCF = 180° ⇒ 55° + ( β + 55°) + α = 180° ⇒α + β + 110° = 180° ⇒α + β = 70° ∴ Ans is 70.