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HonourableDragon6239

Hi, could you please help me for this question? Thank you.

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CuriumTenace9741

Hi, you should use the property of vectors in right triangles which states that the length of a side is the geometric mean between the length of the projection of this side and the length of the hypotenuse so you need to prove the isometry.

You can use this conceptsheet.

https://www.alloprof.qc.ca/en/students/vl/mathematics/the-orthogonal-projection-of-a-vector-m1474