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 KCSE Mathematics Paper 1 Revision Exercise Set 1

The diagram below represents a right cone of base radius 28cm from
which a small cone is cut off to form a frustum. The top radius of the frustum is 21cm and its height is 10cm as shown.
1182020509.PNG
Calculate to the nearest whole number the total surface area of the frustum

 (5m 53s)
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