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Caleb has a piece of rectangular paper that is 12 inches wide by 16 inches long. He drew a straight line along the diagonal of the paper. What is the length of the line Caleb drew?

Sagot :

Chayieegaloidn
use the pythagorean theorem, since the diagonal cuts the rectangle into 2 right triangles. 

let x = length of diagonal
so 12²+16²=x²
     144 + 256 = x²
     x² = 400 
     x = 20 inches.