A portrait of George Washington is square and has an area of 169 square centimeters. How long is each side of the portrait?

13

13 is right. It's the square root of 169.

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To find the length of each side of the square portrait, we can use the equation for the area of a square.

The equation for the area of a square is: Area = side^2

Given that the area of the portrait is 169 square centimeters, we can substitute this value into the equation and solve for the side length.

169 = side^2

To find the side length, we need to take the square root of both sides of the equation:

√169 = √(side^2)

√169 = side

Since the square root of 169 is 13, we find that the length of each side of the portrait is 13 centimeters.