wyznacz cosinus kąta ostrego rombu o boku 3cm i wysokości 2cm
a=3cm
h=2cm
b^2=a^2-h^2
b^2=3^2-2^2
b^2=9-4
b^2=5
b=√5
cosα=b/a
cosα=√5/3
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a=3cm
h=2cm
b^2=a^2-h^2
b^2=3^2-2^2
b^2=9-4
b^2=5
b=√5
cosα=b/a
cosα=√5/3