sina = 2/3
cosa = ⅓√5
tan a = ⅖√5
Diketahui :
segitiga:
r = 3
x = √5
Ditanya :
sina, cosa, tan a
pembahasan:
r² = x²+y²
3² = (√5)²+y²
9 = 5 + y²
y² = 4
y = 2
sina = y/r = 2/3
cosa = x/r = √5 /3 = ⅓√5
tan a = y/x = 2/√5 = ⅖√5
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sina = 2/3
cosa = ⅓√5
tan a = ⅖√5
Diketahui :
segitiga:
r = 3
x = √5
Ditanya :
sina, cosa, tan a
pembahasan:
r² = x²+y²
3² = (√5)²+y²
9 = 5 + y²
y² = 4
y = 2
sina = y/r = 2/3
cosa = x/r = √5 /3 = ⅓√5
tan a = y/x = 2/√5 = ⅖√5