i have a problem at present. i have 2 problems.
the 1st problem is i do not know the mathematical calculation or theory to work out what i need to know and therefore i have no idea how to write a formula for excel either.

i will describe my issues and hope someone may be able to help.

i have a block. length is 100mm and width is 50mm
i have measured the block in all 4 corners to find the thickness of the block
top left corner is 4.75mm
top right corner is 4.77mm
bottom left corner is 3.86mm
bottom right corner is 3.89mm

i would like to try and find out the angle differences accross the block
so i would like to know what the angle is between the top left hand corner and the bottom left hand corner, the angle difference between the top right hand corner and the bottom right hand corner and i would also like to know what the angle difference is across the whole length of the block.

if someone could help me with this it would be fantastic