Find the area of the rectangle if the length is 2 times the width of 66 mm.

1) Calculate the length of the rectangle. The problem says that the length is 2 times the width, which means that to find the length of the rectangle, you need to multiply the width by 2.
Let us denote by a letter the length of the rectangle, b – the width.
a = b × 2 = 66 × 2 = 132 mm.
2) Calculate the area of the rectangle:
S = a × b,
Substitute the known values of the length and width into the formula, find the area:
S = 132 × 66 = 8712 mm².
Answer: the area of the rectangle is 8712 mm².