A circle has an area of 45cm2 . What is the radius of the circle ?
Solution
Correct Answer: Option A
Solution:
একটি বৃত্তের ক্ষেত্রফল 45 বর্গসেন্টিমিটার । বৃত্তের ব্যাসার্ধ কত ?
The area of a circle = \(\pi \)r2 = 45
=> r2 = \(\frac{{45}}{\pi }\) => r2 = \(\frac{{45}}{{3.1428}}\)
=> r2 = 14.3184 => r2 = 14.319
=> r = \(\sqrt {14.319} \) r = 3.78 cm
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