Quantitative Aptitude Geometry Triangles

একটি ত্রিভুজ ABC-তে, যদি \(\frac{1}{2}\) ∠A + ∠B + ∠C = 120° হয়, তাহলে \(\frac{1}{4}\)∠A এর মান কত?

1
20°
2
40°
3
60°
4
30°

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