# Math

posted by .

What is the approximate length of the diagonal of a square if the perimeter of the square is 12ft?
a. 1.7ft
b. 3.5ft
c. 4.2ft
d. 12.7ft
and how?I was confused on this question I tried to subtract and divide but nothing work.

• Math -

B.

• Math -

Erin is wrong.

12/4 = 3

a^2 + b^2 = c^2
3^2 + 3^2 = c^2
9 + 9 = 18

What is the square root of 18?

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