berapa nilai cosec sudut ABC

Maaf klu gambar agak buram kak

sin (π/4) / 8 = sin ∠BAC / 4√2
sin (180/4) / 8 = sin ∠BAC / 4√2
sin 45 / 8 = sin ∠BAC / 4√2
1/2√2 / 8 = sin ∠BAC / 4√2
1/2√2 . 4√2 / 8 = sin ∠BAC
4/ 8 = sin ∠BAC
sin ∠BAC = 1/2

cosec ∠BAC = 1/sin ∠BAC
Cosec ∠BAC = 1/(1/2)
Cosec  ∠BAC = 2

jadi, Cosec  ∠BAC adalah 2