Let the size of the seventh grade band be s That means the size of the eighth grade band must be 3s because it is 3 times as big as the seventh grade band. Combined, the two bands have 188 members. 3s and s combined is 4s. Thus 4s must equal 188.
The area of a regular octagon is: A = a * P / 2, where a is an apothem and P is a perimeter. P = 8 * 8 m = 64 m A = 9.7 m * 64 m / 2 A = 620.8 / 2 m² A = 310.4 m² Answer: The area of a regular octagon is 310.4 m².