OK so to get the total surface area (TSA) you can start of by by finding the area of the front side and the top view of the prism. To find the area of the sides you should use the formula l x w=area. After you find the areas of the sides add them all together and times the sum by 2. Now after you did that you have the area of the rectangular prism.
OK the Triangular Prism is probably the easiest of them all. All you have to do is draw a net of the prism and label all the measurements. After you have done that you find the area of the faces using the formula which is b x h /2 = Area. After you have done all of that you need to get the TSA so to do that you need to add up the total of each side and you will have the TSA.
OK now onto the cylinder the hard one. OK so first you have to draw the net of the cylinder. Then second you have to find the radius you have to use the formula d/2=r. Then third you have to find the circumference by using the formula pi x d=c . After you have done that you need to find the area of the circle to find that you use the formula pi x r x r= Area. After that you must find the area of the rectangle to do that you use the formula l x w Now that you have the area of the circle and the rectangle you add that to the TSA and then you have the answer.
Sorry my videos wouldn't upload so here are the link to them please enjoy.