Zbuduj taki kąt α, α ∈ (0°,90°), dla którego a) cos α = ⅚
cos α=
x=5
r=6
x²+y²=r²
5²+y²=6²
y²=36-25=11
y=√11 v y=-√11sprzeczny bo α ∈ (0°,90°)
b) tg α = ⅓
tgα=
y=1
x=3
c) ctg α = 4
ctgα=
x=4
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Zbuduj taki kąt α, α ∈ (0°,90°), dla którego
a) cos α = ⅚
cos α=
x=5
r=6
x²+y²=r²
5²+y²=6²
y²=36-25=11
y=√11 v y=-√11sprzeczny bo α ∈ (0°,90°)
b) tg α = ⅓
tgα=
y=1
x=3
c) ctg α = 4
ctgα=
x=4
y=1