ABCD বৃত্তস্থ চতুর্ভুজের \(\angle\)A=120° হলে \(\angle\)C এর বৃত্তীয় মান∶ (a) \(\cfrac{π}{3}\) (b) \(\cfrac{π}{6}\) (c) \(\cfrac{π}{2}\) (d) \(\cfrac{2π}{3}\)
Answer: A
\(\angle\)C=180°-\(\angle\)A
=180°-120°=60°
=60×\(\cfrac{\pi}{180}\)=\(\cfrac{\pi}{3}\)
\(\angle\)C=180°-\(\angle\)A
=180°-120°=60°
=60×\(\cfrac{\pi}{180}\)=\(\cfrac{\pi}{3}\)