HELP! I dont understand this! (BRAINLIEST)

The answer is 133.45 feet (approximately)here's how: the arc length in degrees is to 360 as the arc length in linear measure is to the circumference of the circle.arc length in degrees = same as central angle that cuts it off360 degrees =  degree of a whole circlecircumference of the circle = 2pi rr = 85 ft90/360 = al / (2pi (85))  where: al = the arc length in linear measure  1/4 = al / (170 pi)4 al = 170 pial = 42.5 pipi is equivalent to 3.14al = 42.5 * 3.14al = 133.45 ft (approximately)