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## Homework Statement

Determine a simplified, factorised expression, in terms of the radius (r), for the surface area of a cone where diameter (D) = perpendicular height (h)

## Homework Equations

A = πr (r + √(h^2 + r^2))

## The Attempt at a Solution

h=D=2r

A = πr (r + √(2r^2 + r^2))

A/π = r (r + √(2r^2 + r^2))

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