If vector OA = 4i + 3j , OB = 6i - 2j , OC = 2i - j , find vector AB,BC and CA and deduce the lengths of the sides of the triangle ABC

Answer 1

AB = OB - OA = 6i - 2j - (4i + 3j) = 2i - 5j |AB| = √(29)

BC = OC - OB = 2i - j - (6i - 2j) = -4i + j |BC| = √(17)

CA = OA - OC = 4i + 3j - (2i - j) = 2i + 4j |CA| = √(20)