Лайфхаки #геометрия #ЕГЭ #математика профильный уровень #репетитор

Взаимное расположение двух прямых в пространстве формулировки и примеры #ЕГЭ2019 Теорема о трех перпендикулярах и обратная ей В правильной четырехугольной пирамиде высота равна 12 см, а апофема – 15 см. Найдите боковое ребро пирамиды. One event at Pentor sports day is throwing a tennis ball. The distance a child throws a tennis ball is modelled by a normal distribution with mean 32 m and standard deviation 12 m. Any child who throws the tennis ball more than 50 m is awarded a gold certificate. Show that, to 3 significant figures, % of children are awarded a gold certificate. A silver certificate is awarded to any child who throws the tennis ball more than d metres but less than 50 m. Given that 19.1% of the children are awarded a silver certificate, find the value of d. Three children are selected at random from those who take part in the throwing a tennis ball event. Find the probability that 1 is awarded a gold certificate and 2 are awarded silver certificates. Give your answer to 2 significant figures.