Question

Много балов!!! Помогите плиз!!!

Answer 1

1.
<A = 4x, <B = 5x, <C = 6x
4x + 5x + 6x =180
15x = 180
x = 12
<A = 4·12 = 48°
<B = 5·12 = 60°
<C = 6·12 = 72°

2.
AB : AB₁ = BC : BC₁ = 5 : 9
Тогда AB : BB₁ = 5 : 4

3.
CD : AB = DO : AO = 6 : 3 = 2
CD = 2·AB = 2·4 = 8