Question

A rectangle has a width of 9 units and a length of 40 units. What is the length of a diagonal?

Answer 1

the answer is 41 unit

Answer 2

Given 
Length of the rectangle = 40 units and
Breadth of the rectangle = 9 units 
By using the Pythagoras Theorem we can find the diagonal of the rectangle
i.e., diagonal squared= length squared + breadth squared 
                                    ⇒(40)²+ 9²
                                   = 1600 + 81
                                    = 1681
Therefore length of the diagonal = √1681
                                                    = 41 units  

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Hope this helps