Judgment. 1 the side length and perimeter of a square are in direct proportion (). 2 the side length and area of a square are in direct proportion ()

Judgment. 1 the side length and perimeter of a square are in direct proportion (). 2 the side length and area of a square are in direct proportion ()

Because the perimeter of a square = side length × 4, that is, C = 4A, so C / a = 4 (certain), so the side length of a square is in direct proportion to its perimeter

The ratio of perimeter to area of a square with side length a is four to a

Wrong. Wrong. Wrong
Perimeter and area are two different concepts, which can't be compared without ratio

For square and circle with equal perimeter, the ratio of side length to radius is______ ：______ The area ratio is______ ：______ ．

The ratio of side length to radius is: C4 ／ C2 π = C4 × 2 π C = π 2, the ratio of area is: (C4) 2 ／ [π × (C2 π) 2] = c216 ／ [π × C24 π 2] = c216 ／ C24 π = c216 × 4 π C2 = π 4, answer: the ratio of side length to radius is π: 2, the ratio of area is π: 4

For square and circle with equal perimeter, the ratio of side length to radius is [], and the ratio of area is []

Let R be the radius of the circle and π R / 2 be the side length
The ratio of side length to radius is π: 2
The area ratio is π: 4