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Measure pivot point to bottom of blade and pivot point to blade tip, measure angle from extreme left to extreme right of pivot point in degrees. If not possible measure the distance from top left point of blade on windscreen to top right point on windscreen.Transfer measurements to large piece of paper and draw a fan shape to represent the readings taken.

Large circle area is pivot to blade tip, squared x 3.142

small circle area is pivot to blade bottom ,squared x3.142

Subtract small circle area from large circle area. This is a full 360 degree blade sweep area. Now take 360 degrees and divide by the angle of sweep, for example if sweep angle is 60 degrees:- 360/60 = 6

Divide answer by 6 to get area cleaned by wiper. Multiply by 2 for both blades in this example.

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Q: How do you calculate area wiped by windscreen wiper?
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