How to find an area of right triangle?

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I'm really new in math, and I need your help. I've been searching for some formulas to calculate an area of this triangle: triangle

I couldn't find anything. Can somebody help me?

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use that $$A=\frac{1}{2}H\cdot x$$ and $x$ is given by $$H\cdot \tan(60^{\circ})=x$$