Question

I've already done some working out but I don't think it's correct...

Answer 1

You are doing great

$Lateral~surface~area~of ~the~cone=\pi * r*l=\pi * 4* \sqrt{12^2+4^2} \\~\\~\\=\pi*4* 4\sqrt{10} =158.9534=~159~~cm^2$

I hope that helps!