We should apply surface area of a cone in order to solve this problem. Indeed, the floor also included in the conditions of the problem. The formula is [tex]A= \pi r ( r+ \sqrt{h^{2}+r^{2} } [/tex]. Setting [tex] \pi =3.14[/tex], calculation shows that [tex]A=3.14 * 12.5 (12.5+ \sqrt{12.5^{2} + 26^{2} ) [/tex] = 556.25 [tex]feet^{2} [/tex]
