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ভূগােলকের যে অক্ষরেখা বরাবর শঙ্কু বা বেলন তল স্পর্শক- রূপে অবস্থান করে সেই অক্ষরেখাকে প্রমাণ অক্ষরেখা বলে।
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ভূগােলকের যে অক্ষরেখা বরাবর শঙ্কু বা বেলন তল স্পর্শক- রূপে অবস্থান করে সেই অক্ষরেখাকে প্রমাণ অক্ষরেখা বলে।