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Soal atas (Lampiran 1)
Dengan:
MN = 4√2 cm
TM = TN = 2√10 cm
Dengan aturan cosinus, diperoleh:
Sehingga:
sin α
= √[1 - cos²α]
= √[1 - (3/5)²]
= √16/25
= 4/5 [C]
Soal tengah (Lampiran 2)
Dengan aturan kosinus, diperoleh:
Soal bawah (Lampiran 3)
Dengan:
PC = cm
CG = cm
PG = cm
Sehingga, dengan aturan kosinus: