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অক্ষরেখা ও দ্রাঘিমারেখাগুলি সরলরেখায় পরস্পরের সমকোণে অবস্থান করে। এর জন্য বেলন অভিক্ষেপটি আয়তাকৃতি হয়।
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অক্ষরেখা ও দ্রাঘিমারেখাগুলি সরলরেখায় পরস্পরের সমকোণে অবস্থান করে। এর জন্য বেলন অভিক্ষেপটি আয়তাকৃতি হয়।