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27 November, 20:46

In order to use the Pythagorean theorem to find the magnitude of a resultant vector, which must be true regarding the two initial vectors?

a) They form a 90 degree angle.

b) They are equal in magnitude.

c) They have the same directions.

d) They are parallel to one another.

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  1. 27 November, 21:04
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    The true option is a) they form a 90 degree angle.

    Pythagorean theorem is valid for right triangles, which is what you can form when the two vectors have a 90 degree angle.

    Regarding the other options:

    b) They are equal in magnitude: this is not a condition because Pythagoream theorem is valid for any magnitude as long as the angle is 90°C.

    c) They have the sam directions: false, because if the two vectors have the same directions the magnitud is the sum of the two magnitudes.

    d) They are parallel: false for a similar reason that c) taking into account if they have the same direction or are opposed ...
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