сosA=sinB, отсюда cosB=√1-sin²B=√1-0,36=0,8 отсюда АВ=8/0,8=10, т.к АВ=ВС по условию то ВС тоже равно 10 теперь рассмотрим треугольник BАD AD по теореме пифагора √100-64=6 тогда DC равно 10-6=4 ВС по теореме пифагора равно √8²+4²=4√5 cosB=sinA, отсюда площадь АВ*ВС*0,5*0.8=40 r-вписанной окружности равен S/p, где p - полуперимтрданного треугольника p=(a+b+c)/2=(10+10+4√5)/2=2(5+√5) подставляем данное значение в формулу выше и получаем 40/2(5+√5)=10/(5+√5) или 1.4
Two blonde twins Isabelle ( Izzy ) and Annabel ( Annie ) Woods moved from the UK to the U.S. to enroll in private schools . In this school, its rules , for example they have to wear uniforms , which they do not like . Their mother died and her father worked as a professor and they have to get a scholarship . As it turned out , fellows here and do not like girls decide to hide it .They meet Tiffany , spoiled girl , whose father is one of the sponsors of the school. At the first meeting it substitutes them . Also, girls are introduced to a group of guys scholarship . In this company there is one guy named Chris who loved Annie. Tiffany decides to get rid of the twins . Together with his friend Justin it substitutes Izzy and Chris on the exam , presenting all as if they were using a cheat sheet . Director decides to exclude Izzy and Chris from school , but they say they can prove their innocence in the school court. At trial, the girls are struggling to bring out into the Tiffany. And despite the fact that Tiffany threatened her father , she and Justin expelled from school .
Two blonde twins Isabelle ( Izzy ) and Annabel ( Annie ) Woods moved from the UK to the U.S. to enroll in private schools . In this school, its rules , for example they have to wear uniforms , which they do not like . Their mother died and her father worked as a professor and they have to get a scholarship . As it turned out , fellows here and do not like girls decide to hide it .They meet Tiffany , spoiled girl , whose father is one of the sponsors of the school. At the first meeting it substitutes them . Also, girls are introduced to a group of guys scholarship . In this company there is one guy named Chris who loved Annie. Tiffany decides to get rid of the twins . Together with his friend Justin it substitutes Izzy and Chris on the exam , presenting all as if they were using a cheat sheet . Director decides to exclude Izzy and Chris from school , but they say they can prove their innocence in the school court. At trial, the girls are struggling to bring out into the Tiffany. And despite the fact that Tiffany threatened her father , she and Justin expelled from school .
сosA=sinB, отсюда cosB=√1-sin²B=√1-0,36=0,8
отсюда АВ=8/0,8=10, т.к АВ=ВС по условию то ВС тоже равно 10
теперь рассмотрим треугольник BАD
AD по теореме пифагора √100-64=6
тогда DC равно 10-6=4
ВС по теореме пифагора равно √8²+4²=4√5
cosB=sinA, отсюда площадь АВ*ВС*0,5*0.8=40
r-вписанной окружности равен S/p, где p - полуперимтрданного треугольника
p=(a+b+c)/2=(10+10+4√5)/2=2(5+√5)
подставляем данное значение в формулу выше и получаем
40/2(5+√5)=10/(5+√5) или 1.4