To find to find the total surface area (TSA) you can start by finding the area of the front, side and top view of the prism. To find the area of each side you use the formula l x w = A. Once you find the area of each side add them all together and times the sum by two. After hat has been done you now have the area of the rectangular prism.
You have to find the TSA of the triangular prism, first you draw a net of the prism and label the measurements. After that has been done you find the area of all the faces using the formula b x h / 2 = A. Once you have finished finding the area of the sides, you then add up the total of each side and you will have the TSA.
When finding the TSA of a cylinder you have to use many formulas. First you have to draw a net of the cylinder. Second you have to have to find the radius, to find the radius you use the formula d/2=r. Third, you have to find the circumfrence of the circle by using the formula pi x d=c. After that has been done you must find the area of the circle, to find the area you must use the formula pi x r x r =A. Now you have the area of the cylinder, now you must find the area of the rectangle. To do that you use the formula l x w = A. Now that you have the area of both the circle and rectangle you add both areas to get the TSA of the cylinder.