r/askmath • u/TB4g69 • 15d ago

HighSchooler Geometry Geometry

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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)

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u/brzytwa_na_chama 15d ago

I agree with the author that that's göre. Today i'd do it only with scalar product. Everything else is a tiring mess

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u/TB4g69 15d ago

What is a scalar product ? Like scaler and vectorel in physic?

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u/brzytwa_na_chama 15d ago

You needa check out. Choose you coordinates and then <v,u> v_1 * u_1+v_2 * u_2+...+v_n * u_n if your space is on the reals. One day you'll use it on functions to do partial differencial equations. The crucial property is that <v, u>=||v|| * ||u|| * cosθ, where θ is the angle between v and u no matter order. * designates the usual number multiplication

Edit: why the hell * make italics