One side of the rectangle is 2 cm and the other is 1 cm. 4 mm. What is the perimeter of this rectangle?

Recall that a rectangle is a quadrilateral that has two pairs of equal sides, and all four corners are straight (90 degrees). The perimeter of a rectangle is the sum of the lengths of all its sides. Then we get that the given rectangle has two sides with a length of 2 cm and two sides with a length of 1 cm 4 mm. Let’s designate the perimeter with the letter “P” and write down: P = 2 cm + 2 cm + 1 cm 4 mm + 1 cm 4 mm = 6 cm 8 mm (when solving, add centimeters with centimeters, and millimeters with millimeters).
Answer: 6 cm 8 mm.