Lot area and width. Every lot shall have a lot area of not less than 3/4 of an acre and shall be not less than 100 feet at the building line, except that if the lot does not front on a public road, then it shall be connected to an improved public road or street by a right-of-way of a minimum of 20 feet wide, with a paved drive of a minimum width of 10 feet, which right-of-way shall be in addition to the lot area of 3/4 acre.