A circle's diameter is always double it's radius. So a circle of diameter 8.5 has a radius of 4.25. Half of 8.5
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360° subtends the complete circle of length 2πr. So, the ratio of 85/360 = A/2πr.......where A is the arc length A/26π = 85/360 A = 85 x 26π/360 = 19.286 units.
73.75
765
85 x 85 = 7225
15% of 85 = 15% * 85 = 0.15 * 85 = 12.75