Step-by-step explanation:The perimeter of a rectangle is calculated by adding up the lengths of all its sides. Since a rectangle has two pairs of equal sides, the formula is: Perimeter = 2 * (length + width) Let's plug in the given values: Perimeter = 2 * (3.15 cm + 1.284 cm)Perimeter = 2 * 4.434 cmPerimeter = 8.868 cm Therefore, the perimeter of the rectangle is 8.868 cmHOPE IT HELPS YOU