allerypi ক 22/7 হিচাপে লৈ, 7 cm ব্যাসাৰ্ধৰ এটা বৃত্তৰ কালি কিমান?
A154 cm²
B49 cm²
C44 cm²
D308 cm²
Answer & Solution
Correct answer: A. 154 cm²
বৃত্তৰ কালি হ'ল pi r squared, গতিকে (22/7) x 49 = 154 square centimetres।
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