trigonometri
segitiga siku-siku
x = sisi samping sudut
y = sisi depan sudut
r = sisi miring
no. 7
teta = a
cos a = x/r = 5/6
sec a = 1/cos a = 6/5
y = √(r² - x²)
y = √(6² - 5²)
y = √11
sin a = y/r = 1/6 √11
tan a = y/x = 1/5 √11
•
no. 8
a di kuadran IV
sin a = -1/2
a = 360° - 30° = 330°
cos a = cos 330° = cos 30° = 1/2 √3
tan a = - tan 30° = -1/3 √3
cosec a = 1/sin a = -2
sec a = 1/cos a = 2/3 √3
cotan a = 1/tan a = - √3
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Verified answer
trigonometri
segitiga siku-siku
x = sisi samping sudut
y = sisi depan sudut
r = sisi miring
no. 7
teta = a
cos a = x/r = 5/6
sec a = 1/cos a = 6/5
y = √(r² - x²)
y = √(6² - 5²)
y = √11
sin a = y/r = 1/6 √11
tan a = y/x = 1/5 √11
•
no. 8
a di kuadran IV
sin a = -1/2
a = 360° - 30° = 330°
cos a = cos 330° = cos 30° = 1/2 √3
tan a = - tan 30° = -1/3 √3
cosec a = 1/sin a = -2
sec a = 1/cos a = 2/3 √3
cotan a = 1/tan a = - √3