iphone 4 screen size width and height in cm?

[appdesigner]

Hi everyone

I'm designing an app for iphone 4 and iphone 5.

I know the screen size for the iphone 4 in resolution is 960 x 640 and diagonally it's 3.5inches. But I don't know the screen size width and height in cm.

Can someone please tell me the specifications of the screen size width and height for the iphone 4 in cm.

Thanks for your time