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.
The screen size is 151mm * 94mm
You can always use some mathematics to obtain screen size:
which for Nexus 7, we have:
so we have 151mm x 94mm which Peanut has linked to.
So you want to know the display area ..
(A.) The non-masked (clear) area of the front face:
A simple metric ruler, and ASUS Nexus 7, gives you ..
Answer: 152mm x 95mm
(B.) The area of active pixels, on the IPS LCD display:
display pitch: 216 dpi (pixels per inch, leading edge to leading edge)
pixel size: 96% of pitch (guesstimate, without engineering drawings)
pixel geometry: square (identical height, width)
display size (in pixels): 1280 x 800
screen area: (mathematical)
Answer: 150.4mm x 94.0mm
Actual diagonal width, for ASUS Nexus 7 display area:
Answer: 177.4mm or 6.98 in
try downloading the Screeninfo app from the Google Play store for useful screen info. This works on any other Android device as well.