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
A Place Called Here never expecting to become missing herself as she discovers the world where everything which has ever been lost goes to, a place called Here. Jack goes on a search for Sandy believing that she is the key to finding his brother but learning more about her personal life than he should. Meanwhile, Sandy's possessions keeps getting lost from Here but found in this world. Something is bound to happen but the both of them have yet to know what it is. She was named Sandy because when she was born, her hair had the colour of sand. Although, they turned