Area of a circle "ds" over the whole circle formula_33 is just the arc length, which is its circumference, so this shows that the area "A" enclosed by the circle is equal to formula_34 times the circumference of the circle. Note that the area of a semicircle of radius r can be computed by the integral formula_35. By trigonometric substitution, we substitute formula_36, hence formula_37 The last step follows since the trigonometric identity formula_42 implies that formula_43 and formula_44 have equal integrals over the interval formula_45, using integration by substitution. But on the other hand, since formula_46, the sum of the two integrals is
What Goes Around Comes Around What Goes Around Comes Around What Goes Around Comes Around is an album by Waylon Jennings, released on RCA Victor in 1979. By 1979, Jennings was on the tail end a hot streak that had made him one of the biggest superstars in country music. He had scored twelve Top 10 country hits since 1973 (including six chart toppers) and had recorded 4 straight #1 country albums, with 1977's "Ol' Waylon" also hitting #15 on the pop charts. Along with fellow outlaw Willie Nelson, he was at the forefront of what was being referred to as outlaw country, a musical