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Here is the question:

Here are 2 different ways i tried to approach the question:

In the first way, i tried using pythagoreom theorem by making a right angle, but after i did the question i realized since it did not say it was a right triangle, ic annot assume there is a 90 degrees angle and i cannot use the pythagoras theorem.

Second way i tried using vector addition. However you can see at the end i was stuck.

though i believe vector addition is the way to solve this problem, however we had never done any problems involving the squared of a vector unless it was using the pythagoras theorem,

any suggestions in what i did wrong or what i could do?

Sorry for my messy writing hehe.

thanks

byron

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# Homework Help: Help on triangle proof question

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