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  1. In the following figure, ∠B : ∠C = 2 : 3, find ∠B + ∠C.


    1. 120°
    2. 52°
    3. 78°
    4. 130°
    5. None of these
Correct Option: D

∠DAC = ∠B + ∠C
(Exterior angle prop. of a Δ ABC)
According to question,
130° = 2A + 3A
5A = 130°
A = 26°
∴ ∠B = 52°; ∠C = 78°


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