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Jadi ngebentuk segitiga siku2.tinggi 10cm dgn sudut 60° = alpha.
masuk ke perhitungannya :
sin 60° = a/c
akar3/2 = 10/c
c akar3 = 20
c = 20/akar 3
c = 20/3 akar3
Panjang AC = b = jarak pengamat dgn tiang :
cos 60° = b/c
1/2 = b/ (20/3 akar3)
20/6 akar3 = b
10/3 akar 3 = b
Atau bisa juga langsung pake rumus tan :
tan 60° = a/b
akar3 = 10/b
b = 10/akar 3
b = 10/3 akar 3
Hasil b nya akan tetap sama.