Grade 9 Mathematics - Quadrilaterals, Parallelograms, and Linear Functions

Vocabulary flashcards covering Grade 9 mathematics topics including the parts, properties, and measurements of parallelograms, classification of quadrilaterals, and applications of linear functions.

Solving Problems Involving Parallelograms, Rectangles, Squares, & Rhombuses

A Grade 9 Week 9 competency that involves applying the specific properties of parallelograms, rectangles, squares, or rhombuses to find missing sides, angles, or diagonals.

Classification of Quadrilaterals

The Grade 9 Week 7 topic focused on categorizing four-sided polygons based on their geometric properties.

Opposite Sides

Sides in a quadrilateral that do not share a common vertex, such as sides $AB$ and $CD$, or $BC$ and $AD$ in parallelogram ABCD, where $AB \parallel CD$ and $AD \parallel BC$.

Opposite Angles

Angles positioned across from each other in a quadrilateral, such as $\angle A$ and $\angle C$, or $\angle B$ and $\angle D$ in parallelogram ABCD.

Consecutive Angles

Angles that share a common side in a polygon, such as $\angle A$ and $\angle B$ in parallelogram ABCD.

Diagonals

Line segments connecting non-adjacent vertices in a polygon, represented by $AC$ and $BD$ in parallelogram ABCD.

Perpendicular Height

The perpendicular segment measured from the base of a parallelogram to its opposite parallel side.

Parallelogram Opposite Sides Congruence

The geometric property stating that opposite sides of a parallelogram are equal in length, shown in figure WXYZ where $XY = 36$ implies $WZ = 36$.

Parallelogram Diagonals Bisecting Property

The geometric property stating that the diagonals of a parallelogram bisect each other, shown where segment $XZ = 50$ yields $XM = \frac{1}{2} XZ = 25$.

Solving Real-Life Problems Involving Linear Functions

The Grade 9 Week 6 topic focused on applying linear equations and function relationships to practical context problems.