Triangle help

[eager drift]

I need to find the sides and I have no idea how to, please help

[dark geode]

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[uneven niche]

Well on the left side you have a right triangle

And you know the angle

You can use trig

Here cos(30)=(adj side)/hypotenuse

So cos(30)=g/21

And sin(30)=d/21

Once you determine d you can determine h using tan

tan(60)=d/h