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stroziercameron
05.02.2020 •
Mathematics
Gandalf the grey started in the forest of mirkwood at a point with coordinates (-3, -3) and arrived in the iron hills at the point with coordinates (-2, 2). if he began walking in the direction of the vector v=3i+2j and changes direction only once, when he turns at a right angle, what are the coordinates of the point where he makes the turn.
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Ответ:
And from ⟨3,2⟩ and 90 degrees you know w⃗ =k2⟨−2,3⟩ OR w⃗ =k2⟨2,−3⟩. And you can find z⃗ by looking a the math of the points... from (−3,−3) to (−2,2) is over 1 and up 5 so z⃗ =⟨1,5⟩.
Start and end are points, so (-3, -3) and (-2, 2).
v⃗ +w⃗ =z⃗
v⃗ =k1⟨3,2⟩
w⃗ =k2⟨−2,3⟩
z⃗ =⟨1,5⟩
k1⟨3,2⟩+k2⟨−2,3⟩=⟨1,5⟩
Ответ:
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