The surface area is the area of each shape added together so for the triangle is would be 18x5=120 but because it’s 3D you would times that by 2 to give 240 and then u have to find the area of the rectangles which is 17x2=34 but cuz it’s 3D u would times that by 2 which is 68 therefore 68+120 is 188cm^2 pls make me brainliest
