Diketahui Tan A = 16/30 dan A sudut lancip tentukan nilai dari a.sin A dan B.cos A

a. sin A =
mencari garis miring = √30² + 16² = √900 + 256 = √1156 = 34

sin A = depan/miring = 16/34 = 8/17

b. cos A = samping/miring = 30/34 = 15/17

Kelas 10 Matematika
Bab Trigonometri

tan A = 16/30 = y/x

r = √(x² + y²)
r = (30² + 16²)
r = √(900 + 256)
r = √(1.156)
r =  34 

a] sin A = y/r
sin A = 16/34

b] cos A = x/r
cos A = 30/34