added 'Points' solution

Author: eloyekunle

hackerrank/classes/Points.py

@@ -0,0 +1,32 @@
+import math
+
+class Points(object):
+ def __init__(self, x, y, z):
+ self.x = x
+ self.y = y
+ self.z = z
+ def __sub__(self, other):
+ return Points(self.x - other.x, self.y - other.y, self.z - other.z)
+ def __str__(self):
+ return '({}, {}, {})'.format(self.x, self.y, self.z)
+ def dot(self, other):
+ return (self.x * other.x) + (self.y * other.y) + (self.z * other.z)
+ def cross(self, other):
+ return Points((self.y * other.z) - (self.z * other.y), (self.x * other.z) - (self.z * other.x), (self.x * other.y) - (self.y * other.x))
+ def absolute(self):
+ return pow((self.x ** 2 + self.y ** 2 + self.z ** 2), 0.5)
+
+if __name__ == '__main__':
+ points = list()
+ for i in range(4):
+ a = list(map(float, input().split()))
+ points.append(a)
+
+ a, b, c, d = Points(*points[0]), Points(*points[1]), Points(*points[2]), Points(*points[3])
+ x = (b - a).cross(c - b)
+ y = (c - b).cross(d - c)
+ print(b-a, c-b, d-c)
+ print(x, y)
+ angle = math.acos(x.dot(y) / (x.absolute() * y.absolute()))
+
+ print("%.2f" % math.degrees(angle))