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3. 2080 BP Q.No. 5 चित्रमा एउटा वर्ग आधार भएको पिरामिडको छडके उचाइ 24 से.मि. र किनाराको छड्के लम्बाइ 25 से. मि. छन् । (In the figure the slant height of a square based pyramid is 24 cm and its length of slant edge is 25 cm.). 25cm -24cm a. वर्ग आधार भएको पिरामिडको छडके सतहहरूको क्षेत्रफल पत्ता लगाउने सूत्र लेख्नुहोस् । (Write the formula for finding lateral surface area of a square based pyramid.) [1] Ans: LSA = 2al b. उक्त पिरामिडको आधारको क्षेत्रफल पत्ता लगाउनुहोस् । (Find the area of the base of the pyramid.) [2] Ans: 196 cm c. उक्त पिरामिडको पूरा सतहहरूमा प्रति वर्ग सेन्टिमिटर 50 पैसाका दरले रङ लगाउँदा कति खर्च लाग्छ ? पत्ता लगाउनुहोस् । (What is the total cost of colouring the total surfaces of the pyramid at the rate of 50 paisa per square centimetre ? Find it.) [2] Ans: Rs. 434
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