Calculate the area and perimeter of a rectangle if one side is 7.8 m and the other is 3 times longer.

Find the length of the second side of the rectangle, multiply by 3 the length of the first side, which is 7.8 m.

a = 7.8 m * 3 = 23.4 m.

Find the perimeter of the rectangle, add the length of one side and the other, and multiply their sum by 2.

P = (7.8 m + 23.4 m) * 2 = 62.4 m.

Find the area of the rectangle, multiply the length of one side by the length of the other side.

S = 7.8 m * 23.4 m = 182.52 m².

Answer: the perimeter of the rectangle is 62.4 m, the area is 182.52 m ².