allerypi-এর মান 22/7 ধরে, 7 cm ব্যাসার্ধবিশিষ্ট একটি বৃত্তের ক্ষেত্রফল কত?
A154 cm²
B49 cm²
C44 cm²
D308 cm²
Answer & Solution
Correct answer: A. 154 cm²
বৃত্তের ক্ষেত্রফল হল pi r squared, সুতরাং (22/7) x 49 = 154 square centimetres।
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