Solving for the area between a triangle and chord

How is the height 10 root 3? I labelled the sides correctly (this time) using the 30-60-90 rule, but don’t understand where they got 10 root 3 for the height from. The area of the triangle I was calculating was 25 root 3 divided by 2.

Nevermind, it’s 2 x 5 root 3 to get the full height (QP). Correct?

Yes correct.

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