allery5 cm ব্যাসাৰ্ধৰ এটা বৃত্তৰ কেন্দ্ৰৰ পৰা এটা বিন্দুৰ দূৰত্ব 13 cm। এই বিন্দুৰ পৰা টনা স্পৰ্শকডালৰ দৈৰ্ঘ্য কিমান?
A12 cm
B8 cm
C14 cm
D18 cm
Answer & Solution
Correct answer: A. 12 cm
স্পৰ্শকডাল ব্যাসাৰ্ধৰ ওপৰত লম্ব, গতিকে ইয়াৰ দৈৰ্ঘ্য হৈছে 169 - 25 = 144 ৰ বৰ্গমূল, অৰ্থাৎ 12 cm।
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