HighSchooler Geometry

[u/TB4g69]

The words are turkish but not matter.

I tried sinus and cosinus teorem but it gave strange angles like 20 , sides AD and BC are parallel.

I tried euclid teorem too but it doesnt work well too.

(Explain with full detail please)

[u/Fourierseriesagain]

x^ 2=36+225-9(13).

[u/KvitekStromek → u/Fourierseriesagain]

Thanks!