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21:
b)
Distance = Area of trapezium 1 + Area of trapezium 2 + Area of rectangle
= 150 + 210 + 320 = 680 m
18)
Arc length = perimeter - 2(radius) = (16 + 14.pie) - 2(8) = 14.pie
(x/360) * 2 * pie * 8 = 14pie
16.x.pie/360 = 14.pie
16.x.pie = 360 (14.pie)
x = [360 (14.pie)]/16.pie
x = 315