bantu donggg plis skrng d kumpulin:(

1) Sin α = 3/10

= √10² - 3²
= √100 - 9
= √91

Cos α = √91/10 = (1/10) √91
Tan α = 3/√91 = (3/91) √91

2) tan β = 2/1

= √2² + 1²
= √4 + 1
= √5

Sin α = 1/√5 = (1/5) √5
Cos α = 2/√5 = (2/5) √5

3) Siku² di B

Untuk AB
Sin 30° = AB/AC
½ = AB / 12
AB = 12 / 2
AB = 6

Untuk BC
cos 30° = BC / AC
½√2 = BC / 12
BC = 12√2 /2
BC = 6√2