TOLONG DIBANTU YAA, MAT KLS 10

Mapel : Matematika
Kelas : X SMA
Bab : Trigonometri

Pembahasan :
AB = 14 cm
BC = 10 cm
AC = 12 cm

Cos A = (14² + 12² - 10²)/[2(14)(12)]
Cos A = (196 + 144 - 100)/336
Cos A = 240/336
Cos A = 5/7

Sin A = √[1 - (5/7)²]
Sin A = √[1 - (25/49)]
Sin A = √(24/49)
Sin A = 2/7 √6