8th Grade Semester 1 Review

Front

What is a reflection in geometry?

Back

A reflection is a transformation that creates a mirror image of a shape across a line, known as the line of reflection.

Front

What is the effect of the transformation rule (x, y) → (−x, y)?

Back

This transformation reflects a point across the y-axis.

Front

What does a proportional relationship between x and y look like on a graph?

Back

A proportional relationship is represented by a straight line that passes through the origin (0,0).

Front

How do you calculate the slope of a line?

Back

The slope (m) is calculated using the formula m = (y2 - y1) / (x2 - x1), where (x1, y1) and (x2, y2) are two points on the line.

Front

What is the slope of the line passing through the points (1, 2) and (4, 8)?

Back

The slope is 2.

Front

What is a 180° rotation in the coordinate plane?

Back

A 180° rotation around the origin transforms a point (x, y) to (-x, -y).

Front

What is a translation in geometry?

Back

A translation is a transformation that moves a shape from one location to another without changing its size, shape, or orientation.

Front

What is a dilation in geometry?

Back

A dilation is a transformation that changes the size of a shape but keeps its proportions the same.

Front

What is the difference between rotation and reflection?

Back

Rotation turns a shape around a point, while reflection flips a shape over a line.

Front

What is the line of best fit?

Back

The line of best fit is a straight line that best represents the data on a scatter plot, showing the trend of the data.