Learning Objectives . Text File Input and . Implementing a Modular Design Using Value-Returning Function and Void Functions with Value and Reference Parameter Definition 1. The distance between two points is the length of the path connecting them. In the plane, the Euclidean distance between between points P(y and Pj -(rj,vj), denoted P.P, is given by the Pythagorean theorem Definition 2. Three or more points are said to be collinear if they lie in the same line. Collinear points cannot form the vertices (corners) of a triangle. Three points, P = (z,y), (x2) and B = (z3Ws), are collinear if they satisfy the equation below Definition 3. An isosceles triangle is a triangle with (at least) two equal sides. Definition 4. A triangle with all sides equal is called an equilateral tri- angle A triangle with no two sides equal is called a scalene trian- Definition 5. gle. Definition 6, A triangle is right if m-s-s , where n is the longest side and s and s2 are two other sides. Definition 7. A triangle is acute if m2