the cost of painting the surface of a triangular board at 80 paise per metre square is Rs. 176.40 . If the hieght of the board measures 24.5 m, find its base.
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लंबाई = 8 सेमी, चौड़ाई = 5 सेमी
अलमारी का क्षेत्रफल = l\गुना b
=8cm\times5cm=40cm^2
मार्जिन की चौड़ाई = 1.5 सेमी
कार्डबोर्ड की लंबाई
=8cm-1.5\times2cm
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