Find the surface area of the prism 9mm 12mm 8mm

Step-by-step explanation:

Length , l = 9 mm

Width , w = 12 mm

height , h = 8 mm

Surface area of a prism is given by

S =2 ( lw + wh + hl )

By plugging all the given values we get

S = 2 (9·12+12·8+8·9)

S= 2 ( 108 + 96 + 72 )

S =2 (276)

S = 552 mm^2

So the surface area of the prism is 552 mm^2

for the friend request.

when a figure, such as triangle (xyz) is reflected over the line y = x to create x'y'z' the x-coordinates and y-coordinates of the original image (pre-image) will be reversed for the image. (e.g., (x, y) > (y, x)) this means that the pre-image position of the x- and y-coordinates switch places which in turn provides a mirror like image of the original xyz.  

i notice that when i draw a line segment from x to x', that the points are parallel from each other -- they are exactly across from each other and do not intersect with any other points.  

yes, think i would see the same characteristic if you drew the line segment connecting y with the reflecting line and then y' with the reflecting line because of the essence of reflections. because it is a mirror image, each point was effected the same way which leads me to conclude that they same would apply to y and y'.