What is the length and breadth of ONLY the screen in the Nexus 7? I'm not asking the diagonal values, but the length and breadth ones of the Nexus 7. And only of the LCD screen, not the entire hardware.
You can always use some mathematics to obtain screen size:

X = sqrt ( Z^2 / (1 + (VR/HR)^2) )


where:


  sqrt = Square Root √‾‾‾
  
  X = screen width
  
  Z = diagonal screen size (7" for Nexus 7)
  
  VR = vertical resolution
  
  HR = horizontal resolution


which for Nexus 7, we have:

Z = 7"
VR = 1280
HR = 800


so:


  X = sqrt ( 49 / 3.56)
  
  X = 3.71 inches ~ 94mm
  
  Y = (1280/800) * X = 1.6X
  
  Y = 5.936 inches ~ 151mm


so we have 151mm x 94mm which Peanut has linked to.