একটি বৃত্তের ব্যাস 10% বৃদ্ধি পেলে তার ক্ষেত্রফল শতকরা কত বৃদ্ধি পাবে?
ক) 21%
খ) 41%
গ) 31%
ঘ) 44%
বিস্তারিত ব্যাখ্যা:
ব্যাস 10% বৃদ্ধি পেলে ব্যাসার্ধও 10% বৃদ্ধি পায়। ক্ষেত্রফল = πr²। যদি নতুন ব্যাসার্ধ 1.1r হয় তাহলে নতুন ক্ষেত্রফল হবে π(1.1r)² = 1.21πr²। অর্থাৎ ক্ষেত্রফল 21% বৃদ্ধি পাবে।
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