Unit 9 Retest

Front

What is the translation of a shape 5 units to the right and 2 units down?

Back

The shape moves horizontally 5 units to the right and vertically 2 units down.

Front

What does it mean to reflect a shape over the y-axis?

Back

To reflect a shape over the y-axis, you flip it across the y-axis, changing the sign of the x-coordinates of the points.

Front

Which letters have rotational symmetry?

Back

Letters like 'S', 'O', and 'X' have rotational symmetry, meaning they look the same after a rotation of 180 degrees.

Front

What is a dilation in geometry?

Back

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

Front

What happens when the scale factor of a dilation is less than one?

Back

The dilation is a reduction, making the shape smaller.

Front

How do you find the coordinates of a point after a 90° clockwise rotation?

Back

For a point (x, y), the new coordinates after a 90° clockwise rotation are (y, -x).

Front

What is the difference between translation and reflection?

Back

Translation moves a shape without changing its orientation, while reflection flips it over a line.

Front

What is symmetry in geometry?

Back

Symmetry is when a shape can be divided into parts that are arranged in a balanced and proportional way.

Front

What is the formula for calculating the distance between two points (x1, y1) and (x2, y2)?

Back

The distance formula is √((x2 - x1)² + (y2 - y1)²).

Front

What does it mean for a shape to have line symmetry?

Back

A shape has line symmetry if it can be divided into two identical halves that are mirror images of each other.