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Maths Puzzle
Three circles of radii 4cm, 6cm and 8cm touch each other pairwise externally. The area of the triangle formed by the line-segments joining the centres of the three circkes is
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Q: From 2008 to 2009, book sales decreased by 80%. If sales in 2010 were the same as they were in 2008, by what percent did they increase from 2009 to 2010?
the radius of the base of the right circular cone is doubled. To keep the volume fixed, the height of the cone will be