Compare the area of a rectangle and a square if the lengths of the sides of the rectangle are 40 cm

Compare the area of a rectangle and a square if the lengths of the sides of the rectangle are 40 cm and 10 cm and the length of the side of the square is 20 cm.

40 * 10 = 400cm² rectangle area
20 * 20 = 400cm² square area
Are equal
to find out the area of the rectangle, you need to multiply the length by the width, that is, 40 x 10 you get 400 to find out the area of the square, since its sides are equal, we just need to know only one side that before the new conditions, one side is equal to 20, that is, we multiply 20 by 20 as well it turns out 400