Diketahui :
gambar soal
T(-2, 4)
Ditanya :
cos a
pembahasan :
Rumus :
cos(180 - b) = -cos b
cos b = -cos(180-b)
r² = x²+y²
r² = 2² + 4² = 20
r = √20 = 2√5
cos a = -cos(180-a)
----------------------cos(180-a) = |x|/|r| =2/(2√5)
cos a = -2/(2√5)
cos a = -1/√5
= -⅕√5
jawaban :
OPSI :B. -⅕√5
========================
Detail jawaban:
mapel : matematika
kelas : 10
materi : trigonometri
kode soal :2
kode :10.2.7
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Diketahui :
gambar soal
T(-2, 4)
Ditanya :
cos a
pembahasan :
Rumus :
cos(180 - b) = -cos b
cos b = -cos(180-b)
r² = x²+y²
r² = 2² + 4² = 20
r = √20 = 2√5
cos a = -cos(180-a)
----------------------cos(180-a) = |x|/|r| =2/(2√5)
cos a = -2/(2√5)
cos a = -1/√5
= -⅕√5
jawaban :
OPSI :B. -⅕√5
========================
Detail jawaban:
mapel : matematika
kelas : 10
materi : trigonometri
kode soal :2
kode :10.2.7