text: Geometry: Common Core (15th Edition)
  
  $AC$ = $25$ $in.^2$ $CB$ = $144$ $in.^2$ $BA$ = $169$ $in.^2$
  All we are asked to do is square each of the sides. Remember to square the units as well: First side: $AC$ = $($5$in.)^2$ Square both the value and the unit: $AC$ = $25$ $in.^2$ Second side: $CB$ = $($12$in.)^2$ Square both the value and the unit: $CB$ = $144$ $in.^2$ Third side: $BA$ = $($13$in.)^2$ Square both the value and the unit: $BA$ = $169$ $in.^2$