Question

Помогитеее
Только г) , е)

Answer 1

г)
1) b/с = cos α
12/c = 3/5
c = 12•5/3
c = 20 см
2) a² + b² = c²
a = √(c² - b²)
a = √(20² - 12²) = √(400 - 144) = √256 = 16 см
a = 16 см
3) sin α = a/c
sin α = 16/20 = 4/5
sin α = 4/5
4) tg α = a/b
tg α = 16/12 = 4/3
tg α = 4/3
5) ctg α = b/a
ctg α = 12/16 = 3/4
ctg α = 3/4

е)
1) a² + b² = c²
b = √(c² - a²)
b = √((√5)² - 1²)) = √(5 - 1) = √4 = 2
b = 2 см
2) sin α = a/c
sin α = 1/√5
3) cos α = b/c
cos α = 2/√5
4) tg α = a/b
tg α = 1/2
5) ctg α = b/a
ctg α = 2/1 = 2
ctg α = 2