Existing driveways of asphalt or concrete can be overlaid with asphalt with excellent results. Usually for driveways, a surface course 1.5 to 2 inches thick will suffice. Before paving, be sure the contractor patches any serious holes or cracks with asphalt and compacts it.Otherwise the trouble spots may reflect upwards through your new pavement.sually for driveways, a surface course 1.5 to 2 inches thick will suffice. Before paving, be sure the contractor patches any serious holes or cracks with asphalt and compacts it. Otherwise the trouble spots may reflect upwards through your new pavement.
The radian is the standard unit of angular measure, used in many areas of mathematics. An angle 's measurement in radians is numerically equal to the length of a corresponding arc of a unit circle; one radian is just under 57.3 degrees (when the arc length is equal to the radius).he concept of radian measure, as opposed to the degree of an angle, is normally credited to Roger Cotes in 1714. He described the radian in everything but name, and he recognized its naturalness as a unit of angular measure.
What is the point of using radians for measuring angles? Why not simply stick with degrees? One can answer all the questions perfectly well by converting the radians into degrees, working out the answer, and converting back into radians at the end if necessary. So why bother with radians in the first place?Let us first remind ourselves of the definition of a radian: In a circle with centre O and radius r, if points P and Q on the circumference of the circle are such that angle POQ is one radian, then the length of the arc PQ is equal to the radius of the circle.hat is the point of using radians for measuring angles? Why not simply stick with degrees? One can answer all the questions perfectly well by converting the radians into degrees, working out the answer, and converting back into radians at the end if necessary. So why bother with radians in the first place?