Take the vertex of the square as the center of the circle, and its side length as the radius to draw a circle. The known square area is 12 square centimeters, so it is urgent to find the area of the member! I don't know what root no root, please use primary school knowledge to answer!
Well, you should understand after I change
The area of a square is equal to the square of the side length = 12
The area of a circle = the square of its radius
According to your topic, it is easy to know that the side length of a square is equal to the radius of a circle
So the area of the circle is π * 12 = 12 π