180}^{o}}\]or 30o,
60O
and 90o, therefore sides are in ratio of \[\
SIN
{{30}^{o}}:\sin {{60}^{o}}:\sin {{90}^{o}}\] \[=\frac{1}{
2
}:\frac{\sqrt{3}}{2}:1=1:\sqrt{3}:2\].
NOTE
: This is a fact. We have used it in so many questions.