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kąt β = 180° - 90° - 20° = 70°
sin 20° = y/5 (dzielenie)
0,3420 = y/5
y = 0.3420 × 5
y = 1,71
cos 20° = x/5
0,9397 = x/5
x = 0,9397 × 5
x = 4,70
obw = x + y + 5
obw = 4,70 + 1,71 + 5 = 11,41
b)
kąt β = 180° - 90° - 60° = 30°
cos 60° = 2/y
0,5000 = 2/y
0,5000y = 2/: 0,5000
y = 2 : 0,5000
y = 4
sin 60° = x/4
0,8660 = x/4
x = 0,8660 × 4 = 3,46
obw = x + y + 2
obw = 3,46 + 4 + 2 = 9,46
c)
krótsza przyprostokątna - x
dłuższa przyprostokątna - y
kąt B = 180° - 90° - 72° = 18°
sin 72° = x/7
0,9511 = x/7
x = 0,9511 × 7
x = 6,66
cos 72° = y/7
0,3090 = y/7
y = 0,3090 × 7
y = 2,16
obw = x + y + 7
obw = 6,66 + 2,16 + 7 = 15,82