If
the surface area of the cone is 180 feet^{2}, what is the missing
length? Use 3.14 for π and round the answer to the nearest hundredth.

The missing length is feet.

SA
= πr^{2} + πr × l

r = 4 feet

So, l = (180- 3.14 × 16) ÷ (3.14 × 4)

= 10.33 feet