2. Diketahui Sin B = 6/10
Tentukan :
a. Cosec B
b. Cos B
c. Tan B
⟩ Trigonometri
.
a) 10/6
b) 8/10
c) 6/8
.
» Penyelesaian
.
[A]
Cosec B = 1/Sin B
= 1/(6/10)
= 10/6
.
[B]
Sin B = y/r = 6/10
.
x² = r² - y²
x² = 10² - 6²
x² = 100 - 36
x² = 64
x = √64
x = 8
.
Cos B = x/r
= 8/10
.
[C]
Tan B = Sin B/Cos B
= (6/10)/(8/10)
= 6/8
