alleryএটা বৃত্তাকাৰ বলয় 21 cm আৰু 14 cm ব্যাসাৰ্ধৰ বৃত্তৰে আৱদ্ধ। ইয়াৰ কালি নিৰ্ণয় কৰা (pi = 22/7)।
A1078 cm²
B770 cm²
C308 cm²
D462 cm²
Answer & Solution
Correct answer: B. 770 cm²
বলয়ৰ কালি হ'ল pi (21 squared minus 14 squared) = (22/7)(245) = 770 square centimetres।
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