Doubling the base of a triangle while keeping the height constant will double the area of the triangle. The area of a triangle is directly proportional to its base length, so increasing the base length by a factor of 2 will result in the area being multiplied by 2 as well.
If the other dimensions (length and height) are left unchanged, doubling the width will double the volume.
Doubling the width of a rectangular rug will affect the perimeter because the total length and width will be doubled. The area will be twice the length times the width.
It is increased by x sqrt(2).
The image of each point in the pre-image can be obtained by drawing a perpendicular from the point to the line and then doubling its length.