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
The Play That Goes Wrong 27 previews. A touring production began in Australia at the Comedy Theatre in Melbourne from February 2017, before heading to Adelaide, Sydney, Canberra, Brisbane and Perth. The play is touring North America, starting in September 2018 in Pittsburgh, Pennsylvania. "The Play That Goes Wrong" received positive reviews. Quentin Letts of the "Daily Mail" gave it five stars out of five, saying "As it all goes awry it becomes hard not to gas yourself with laughter. At one point I feared I was going to hyperventilate." Tim Walker of "The Telegraph" gave it four out of five stars and called it