Find the angle between the ray OA and the positive semiaxis Ox? if point A (-3; 3).
| August 31, 2021 | education
OB = 3 cm, AB = OС = 3 cm.
Triangle ОАВ is rectangular, then tgАВ = AB / ОВ = 3/3 = 1.
angle AOB = arctg1 = 45.
Then the angle α = 180 – 45 = 135
Answer: The angle between OA and the positive OX semiaxis is 135.
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