Find the area of a square of radius 39 circumscribed around a circle.

Since the square is circumscribed around a circle, the length of its side will be equal to the diameter of the circle. Knowing the radius of the circle, we can find the diameter of the circle. To do this, you need to multiply the radius of the circle by 2 (two). As a result, we get the diameter of the circle, equal to 39 x 2 = 78. Now, knowing the side of the square, you can find the area of the square. To do this, you need to multiply the side of the square by its other side or square the value of the side of the square. As a result, we get 78 x 78 = 6084.
Answer: the area of the square is 6084.