Determine the area of the green sector and yellow sector.

Area of ENTIRE circle = PI * radius^2
Area = 3.14159 * 3^2
Area = 28.2743338823 square inches

Yellow Area = Circle Area * (75 / 360) = 28.2743338823 * 0.2083333333
Yellow Area = 5.8904862245 square inches

Green Area = Circle Area * (285 / 360) = 28.2743338823 * 0.7916666667 Green Area =  22.3838476578


Double Check
Yellow Area = 5.8904862245 PLUS
Green Area =  22.3838476578   =
TOTAL = 28.2743338823

A) for the n row: 22+(n-1)×6therefore,b) 100-22=78that means (n-1)×6=7878÷6=1313+1=1414th row has 100 seats