Find the perimeter of a rectangular piece of land with an area of 800m2 and one side 2 times the other.

1. Let the length of the rectangle be x meters, then the width is twice as large – 2x.
2. Let’s calculate what the length is equal to from the equation:
x * 2x = 800;
2x ^ 2 = 800;
x ^ 2 = 400;
x = 20;
Length – 20 meters, width – 40 meters.
3. Find the perimeter:
(20 + 40) * 2 = 120 (m);
Answer: the perimeter is 120 m.