Geometry Unit 2 Assessment Review

A set of vocabulary flashcards based on geometry concepts from the Unit 2 Assessment, covering quadrilaterals, transformations, and angle relationships.

Rotational Symmetry ($180^{\circ}$)

A property of certain quadrilaterals, such as the Rhombus, Parallelogram, Rectangle, and Square, where the figure remains unchanged after a rotation of $180^{\circ}$ around its center.

Regular Octagon

An eight-sided polygon with equal side lengths and interior angles, which can be inscribed in a circle.

Smallest positive angle of rotational symmetry

The minimum degree measure a regular polygon must be rotated to map onto itself, calculated by dividing $360^{\circ}$ by the number of sides.

Transformation

A general term for changing the position or orientation of a polygon, including rotations, reflections, and translations.

Translation

A transformation that moves every point of a figure the same distance in a specified direction, such as "down" or "right."

Reflection

A transformation that flips a figure across a line, such as a vertical line, a horizontal line, or the x-axis.

Rotation

A transformation that turns a figure about a fixed point, categorized by direction (clockwise or counterclockwise) and degree (e.g., $90^{\circ}$).

$$(x, y) \rightarrow (x, -y)$$

The specific transformation rule used to map $\triangle ABC$ to $\triangle A'B'C'$, representing a reflection across the x-axis.

Corresponding Angles

Pairs of angles that occupy the same relative position at each intersection where a straight line crosses two others.

Alternate Interior Angles

A pair of angles on opposite sides of the transversal and between the two parallel or non-parallel lines.

Alternate Exterior Angles

A pair of angles on opposite sides of the transversal and outside the two parallel or non-parallel lines.

Same-Side Interior Angles

A pair of angles that are on the same side of the transversal and located between the two lines.

Isosceles Trapezoid

A specific quadrilateral listed in the assessment to be evaluated for rotational symmetry.

Parallelogram

A quadrilateral with two pairs of parallel sides that is identified as having $180^{\circ}$ rotational symmetry.

Rhombus

A quadrilateral with four equal sides that is identified as having $180^{\circ}$ rotational symmetry.