A) By considering the angles between the vectors, show thata+band

a-bare perpendicular when|a|=|b|

Note: all bolded above are vectors (arrows on top)

Below is my attempt on the above questions, please let me know if I have the correct answer (as there are no answers in the back for these questions). Demonstrate any errors that I may have, the correct way. Thanks in advance!

A) well I drew two right angled triangles

the first has a as the base, b as the height and hypotenuse is a+b, the second has a as base, -b as height, and hypotenuse is a-b

.. not sure about this