Geometry Unit 2

Front

What is the definition of congruent shapes?

Back

Two shapes are congruent if they have the same size and shape, meaning all corresponding sides and angles are equal.

Front

What is a rigid transformation?

Back

A rigid transformation is a movement of a shape that preserves its size and shape, including translations, rotations, and reflections.

Front

How many lines of symmetry does a trapezoid have?

Back

A trapezoid has 0 lines of symmetry unless it is an isosceles trapezoid, which has 1 line of symmetry.

Front

What is rotational symmetry?

Back

Rotational symmetry is when a shape can be rotated around a central point and still look the same at certain angles.

Front

Which figure has the greatest order of rotational symmetry?

Back

A circle has infinite rotational symmetry because it looks the same at any angle of rotation.

Front

What happens to a rectangle when it undergoes a reflection across the x-axis?

Back

The resulting image is still a rectangle because reflections preserve parallel and perpendicular lines.

Front

What is the order of rotational symmetry for a square?

Back

A square has an order of rotational symmetry of 4, as it can be rotated 90 degrees four times to look the same.

Front

What is the definition of a line of symmetry?

Back

A line of symmetry is a line that divides a shape into two identical halves that are mirror images of each other.

Front

What is the difference between rigid and non-rigid transformations?

Back

Rigid transformations preserve the shape and size of a figure, while non-rigid transformations can change the size or shape.

Front

How do you determine the number of lines of symmetry in a polygon?

Back

Count the number of ways you can fold the polygon so that the two halves match exactly.