allery21 চে.মি. ব্যাসাৰ্ধৰ এটা বৃত্তাকাৰ খণ্ডৰ পৰিধি 86 চে.মি. ইয়াৰ অঞ্চল বিচাৰি উলিয়াওক; π = 22/7 ব্যৱহাৰ কৰক।
A462 cm²
B231 cm²
C693 cm²
D924 cm²
Answer & Solution
Correct answer: A. 462 cm²
চাপটো 86−2×21 = 44 চে.মি., যাৰ ফলত কোণটো 44/132×360° =120°;
ক্ষেত্ৰফল 120/360×(22/7)×21² =462 cm²
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