The radius is half the diameter, so equals 7.
Area of a circle= pi x r^2, which means that the area of the circle is 49pi.
Then, multiply by 2 to get the second circle. 98pi.
Circumference of circle=pi x d, so equals 14pi. Multiply by 18 to bet the side of the cylinder. 252 pi.
Add them all together to get 350pi cm^2.
Hope this helps :)