Geometry

Step 1: Understanding a straight line.
A straight line is defined as a line that connects two points with no curvature. It can be drawn using a scale or ruler and represents the shortest distance between two points.
Step 2: Analyzing the options.
- (a) Line drawn by a scale: This option is partially correct, as a straight line can indeed be drawn with a scale, but this doesn't define what a straight line is.
- (b) Line drawn to join the distance between two points: This is correct. A straight line is defined by connecting two points.
- (c) Line creating a form: This is incorrect. A form is created by multiple lines, not a single straight line.
- (d) Line creating a painting: This is incorrect. A painting is created using different techniques and materials, not just a straight line.
Step 3: Conclusion.
The correct answer is (b) Line drawn to join the distance between two points, as that is the definition of a straight line.
Final Answer: The correct answer is (b) Line drawn to join the distance between two points.