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4][
A sudut lancip
semua nilai perbandingan trigonometri dg sudut A, bernilai positif.

cot A = cos A / sin A = x/y = p/1 = p
r = √(1² + p²)

sin A = y/r = 1/√(1 + p²)

cos A = x/r = p/√(1 + p²)

tan A = 1/cot A = 1/p

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∆ABC siku di C
A = 55°
B = 90° - 55° = 35°
AB = 2 cm

panjang sisi a = BC
BC = AB sin 55°
BC = 2 × 0,82
BC = 1,64 cm

panjang sisi b = AC
AC = AB cos 55°
AC = 2 × 0,57
AC = 1,14 cm