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.
You will be charged an additional âdisposal feeâ of around $10. This is for safe and legal disposal of the damaged windshield. If you opt for at-home replacement, $20 to $40 will be added to your bill for mobile service. The majority of replacements range from $200 to $300 for older model sedans from the 1990âs.