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    				| 1. | An umbrella is made by stitching 10 triangular pieces of cloth of two different colour, each piece measuring 20 cm, 50 cm and 50 cm. How much cloth of each colour is required for the umbrella? | 
| Answer» s=(a+b+c)/2=60cm Heroes formula area=`sqrt(s(s-a)(s-b)(s-c))` =`sqrt(60(60-50)(60-50)(60-20))` =`200sqrt6` There are total 10 piecesFirst colour=`5*200sqrt6=1000sqrt6` Second color=`5*200sqrt6=1000sqrt6` | |