Question

In a ∆ABC, ∠C = 3 ∠B = 2(∠A + ∠B). Then, ∠A + ∠B =​

Answer 1

It's answer is. 60°

Step-by-step explanation:

we know that angle A +angle b + angle c = 180°

so , angle a + anlge b + 2(angle a + angle b) =180° ( because angle c = 2(angle a + angle b)

3angle a + 3angle b =180

3 ( angle a + angle b) = 180°

Now , angle a + angle b = 60 °

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