Categories: Coordinate Geometry
(If you get a negative angle, take its absolute value. Also, when two lines intersect, they form two pairs of equal angles. Unless the lines are perpendicular, one pair will be acute and the other obtuse. You want to find the acute pair, so if you calculated the obtuse pair just subtract the value from pi radians or $180°$ to get the acute.
In other languages:
Español: encontrar el ángulo entre dos vectores, Deutsch: Den Winkel zwischen zwei Vektoren finden, Português: Achar o Ângulo Entre Dois Vértices, Italiano: Calcolare l'Angolo tra Due Vettori, Français: calculer l’angle entre deux vecteurs, Русский: найти угол между векторами, Nederlands: De hoek tussen twee vectoren vinden, Bahasa Indonesia: Mencari Sudut antara Dua Vektor, 中文: 找到两个向量的夹角, ไทย: หามุมระหว่างสองเวกเตอร์, 日本語: 2つのベクトルの角度を求める, Tiếng Việt: Tìm góc giữa hai véc tơ, العربية: إيجاد الزاوية بين متجهين, हिन्दी: दो वेक्टर्स के बीच का कोण ज्ञात करें, 한국어: 두 벡터 사이 각도 구하기, Türkçe: İki Vektör Arasındaki Açı Nasıl Bulunur
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