Pythagoras developed the method to solve this- A squared plus B squared equals C squared. A squared= 8x8, added to B squared (also 8x8) So that is 64+64 or 128. So 128 is line C squared. Find the square root of 128, and you have C, which is the diagonal. (Hint- it is 11.31)
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26.4 inches for the diagonal.
The diagonal of a rectangle with the length of 89.5 inches and a width of 48 inches is approximately 101.6 inches.
The diagonal of a 101 inch square is about 142.84 inches.
Using Pythagoras' theorem the diagonal works out as 51 inches
To find the diagonal length of a rectangle use Pythagoras' theorem for a right angle triangle.