What is the surface area of an open-topped can with these dimensions? H-12 cm // R-6cm

Answer 1

We know the formula for SA of a cylinder is SA=2πrh+2πr²

However, we don't have a top so we only need the area of the circular base which makes the 2πr² into 1πr² or just πr²

Thus, SA=2πrh+πr²=2π(6)(12)+π(6)²=144π+36π=180π cm²

Hope this helps!