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.
â¢ How long will it take to replace my windshield glass? The time it takes would depend on the make and model of your vehicle. The average car or truck replacement windshield installation typically takes from 45 to 90 minutes. The professionally trained team at Phoenix Glass can evaluate your windshield chip or break to determine if your windshield can or should be repaired or replaced.