Earth is a sphere so it doesn't have a perimeter. Circles have perimeters. However, if you wanted to know it's surface area then that is 510,072,000 km².
it is the area of a solid object times by the square root of the perimiter
circumference
base times height minus half of the perimiter base times height minus half of the perimiter
no...it's not
Twice (length + width)
56
the area is 18
perimiter
to find the perimiter you just add up all the sides....Perimiter is the same for every figure.
The outer boundary of a body or figure.
the perimiter =D
multiply all of the sides than that is your answer