diketahui segitaga KLM jika sudut K=63°, sudut L=102°, nilai sin M adalah?

KLM =K+L+M
180 =63+102+M
180 = 165+M
M. = 180-165
= 15

Bab Trigonometri
Matematika SMA Kelas X

∠M = 180° - ∠K - ∠L
∠M = 180° - 63° - 120°
∠M = 15°

sin M = sin (45° - 30°)
sin M = sin 45° cos 30° - cos 45° sin 30°
sin M = (1/2 √2) . (1/2 √3) - (1/2 √2) . 1/2
sin M = (1/4) √6 - (1/4) √2
sin M = (1/4) (√6 - √2)