Question

the diagonal of a square is 9 root 2 which is the the side​

Answer 1

area of square = 1/2 × diagonal × diagonal

both diagonal of square are equal.

area of square = 1/2×9√2×9√2

=81

area of square = side×side

81=(side)square

9 = side

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Answer 2

Answer:

9

Step-by-step explanation:

$a = d \div \sqrt{2}$

$a = 9 \sqrt{2 } \div \sqrt{2}$

$a = 9$