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10 cards from this deck
Same fundamental principles
Break down into simpler 2D triangles
Create a right-angled triangle
Draw a 2D sketch and mark side lengths
Apply trigonometry to find the angle
Pythagoras' theorem
Yes, they work perfectly well in 3D
a2=b2+c2−2bccosAa^2 = b^2 + c^2 - 2bc \cos Aa2=b2+c2−2bccosA
They naturally create right-angled triangles
Trying to solve directly in 3D instead of breaking into 2D
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