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We get the height of the cone

h^{2 }= l^{2 }– r^{2}

h^{2} = 2.1^{2} – 1.7^{2}

h = Sqrt (1.52)

h = 1.23

r = 1.7

S/A = π r ( r + Sqrt ( r^{2} + h^{2} ) )

S/A = 20.28566

S/ A = 20. 29

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