Your home task is to write essay about your DNA .. Who are you like, what percentage and Who famous - id1363648120221026 от danifoxyforevep08iko 26.10.2022 00:29

Question

Геометрия: Your home task is to write essay about your DNA .. Who are you like, what percentage and Who famous person would you like to be like..​

danifoxyforevep08iko · Accepted Answer

a=BC, b=AC, c=AB Пусть биссектриса BD=x, а ∠ADB=α
по теореме косинусов a²=b²+c²-2bccosA cosA=(b²+c²-a²)/2bc=804/924=67/77
sin²A=1-cos²A=1440/77²=36*40/77² sinA=4*√40/77
b²=a²+c²-2accosB cosB=(a²+c²-b²)/2ac=164/484=41/121 cosB=cos2*(B/2)
=cos²B/2-sin²B/2=1-2sin²(B/2) sin²B/2=(1-cosB)/2=40/121 sin(B/2)=√40/11
по теореме синусов:
BD/sinA=c/sinα=AD/sin(B/2)
BD/sinC=a/sin(180-α)=DC/sinB/2
берем вторые равенства и складываем sin(180-α)=sinα
(с+a)/sinα=(AD+DC)/sin(B/2)=b/sin(B/2)
sinα=(c+a)*sin(B/2)/b=33*√40/11*21=√40/7
по теореме синусов
с/sinα=BD/sinA
BD=c*sinA/sinα=22*4*√40*7/(77*√40)=8

Your home task is to write essay about your DNA .. Who are you like, what percentage and Who famous person would you like to be like..​

MOGZ ответил

Your home task is to write essay about your DNA .. Who are you like, what percentage and Who famous person would you like to be like..