The interior angles of a simple (and planar) quadrilateral ABCD add up to 360 degrees of arc, that is. This is a special case of the n-gon interior angle sum formula (n â 2) Ã 180Â°. All convex quadrilaterals tile the plane by repeated rotation around the midpoints of their edges.
1 CostHelper readers report paying $150-$300 for a windshield replacement, at an average cost of $214. 2  WindshieldsToGo.com provides an online form to estimate the cost of windshield replacement with and without installation, based on zip code and the year, make, model and style of vehicle.
The cost to repair most cracks is about the same. However, if the crack is longer than three inches, it may require special treatment. Long-crack specialist Novus typically charges about $70 to repair a six- to twelve-inch windshield crack. Windshield replacement costs considerably more and varies greatly depending on the vehicle.