How could Lynn calculate the length of the diagonal of a square?

A. by multiplying the length of the square times itself
B. by adding the lengths of all four sides of the square
C. by multiplying 1/2 by the length of the base times the height
D. by squaring one side length and doubling the value; then taking the square root of that value

D. By doubling one side length and doubling the value; then taking the square root of that value

Step-by-step explanation:

A square as all its sides equal and all the angles in a square are right angles (90°).

Hence, Pythagoras theorem can be applied since the diagonal is the longest side of a square

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step-by-step explanation: