The perimeter of a regular octagon with side \( s \) is 8 s . Kiera is making a planter shaped like an octagon to surround the base of her favorite oak tree. Each side of the planter will be 9 inches long. What is the perimeter of the planter? Write your answer as a whole number or decimal. Submit

To find the perimeter of Kiera's octagonal planter, we use the formula for the perimeter of a regular octagon, which is the number of sides (8) multiplied by the length of one side \( s \). Since each side is 9 inches long, we calculate: \[ \text{Perimeter} = 8 \times 9 = 72 \text{ inches} \] So, the perimeter of the planter is 72 inches. Another fun fact: octagons are not just for planters! These eight-sided shapes pop up everywhere—think stop signs and certain tiles. They provide a unique look and can be easily arranged to create interesting patterns, making them popular in architecture and design too.