Let x be the distance from the base of the plateau to you. Draw the situation as shown:
[Triangle]

Since x is the side adjacent the 60° angle and we are given the length of the side opposite the angle, then we can use the tangent ratio to write: \(\displaystyle{\tan{{60}}}°={o}{p}\frac{{p}}{{a}}{d}{j}=\frac{{50}}{{x}}\)

\(\displaystyle{x}=\frac{{50}}{{\tan{{60}}}}°\)

Use a calculator in DEGREE mode x ~ 28.9m

Since x is the side adjacent the 60° angle and we are given the length of the side opposite the angle, then we can use the tangent ratio to write: \(\displaystyle{\tan{{60}}}°={o}{p}\frac{{p}}{{a}}{d}{j}=\frac{{50}}{{x}}\)

\(\displaystyle{x}=\frac{{50}}{{\tan{{60}}}}°\)

Use a calculator in DEGREE mode x ~ 28.9m