Topic 2. when we talk about fashion we usually mean the popular style in dress or behavior. for most modern people fashion is a method of wearing to express themselves. what do you think about it? • talk about the clothes you are wearing today. do you like them? why? / why not? • what new clothes would you like to buy? • have you ever bought fashion magazines? why? / why not? • what are some of your favorite brands of clothing? • why do people spend lots of money on clothes? • what do clothes tell people about our personalities?
можно через переменные решитьпусть < оав - х, а < ова - у
рассмотрим δ аовх + у + 98 = 180 (по теореме)
х + у = 82
2) рассмотрим δ авс
т.к аn и вl -биссектрисы,то < а = < оав * 2 = 2х и < в = 2 * ова = 2 у
< с примем за z
2 х + 2 у + z = 180 2 (x + y) + z = 180
2 * 82 + z = 180
z + 164 = 180
z = 180 - 164 = 16
внешний < при < с = 180 - 16 = 164
ответ : 164