Find the length of the pencil. 
Definitions:
Interaction
The effect that occurs when the impact of one variable on a response variable changes depending on the level of another variable in statistical models.
Straight Lines
The shortest distance between two points on a plane, characterized by an unchanging direction.
Coefficient of Determination
A statistical measure represented as \(R^2\) that shows the proportion of variance for a dependent variable explained by an independent variable or variables in a regression model.
Simple Linear Model
A statistical model used to describe the relationship between two variables through a linear equation.
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