Math Exam Review - Grade 9

Math exam review flashcards for 9th grade, covering properties, proofs, angle measurements, geometric theorems, line equations, and triangle congruence.

What property justifies subtracting the same value from both sides of an equation?

Property of Subtraction

What property justifies multiplying both sides of an equation by the same value?

Property of Multiplication

What property justifies adding the same value to both sides of an equation?

Property of Addition

Which property relates to both multiplication and division operations in equations?

Property of Multiplication or Division

Which property involves distributing a value across terms inside parentheses?

Distributive Property

Which property allows replacing a quantity with an equal quantity?

Substitution Property

Which property states that if a = b and b = c, then a = c?

Transitive Property

Which property allows changing the order of an equation a=b to b=a?

Symmetric Property

In determining if a statement is correct, what is the highest level of validity?

Always True

In determining if a statement is correct, what is the average level of validity?

Sometimes True

In determining if a statement is correct, what is the lowest level of validity?

Never True

What is the slope of a vertical line?

Undefined

What is true of the slope of two distinct lines that never intersect?

The lines are parallel.

What is true of the slopes of two intersecting lines that form a right angle?

The lines are perpendicular.

How is a transverse that intersects a transversal formed?

the Straight Line s, Corresponding

How is a transvers interior consecutive transvers formed?

Straight Line r, Interior Consecutive

How is a transverse interior alternating transvers formed?

Straight Line T, Interior Alternating

How is a transvers that intersects a transversal formed?

Straight Line v, Corresponding

How would you classify a triangle with only angles less than 90?

Acute Angle

How would you classify a triangle with only angles 60 degrees?

Equiangular

How would you classify a triangle with one angle greater than 90 degrees?

Obtuse Angle

How would you classify a triangle with one angle 90 degrees?

Right Angle

In proofs, what justifies stating that corresponding parts of congruent triangles are congruent (CPCTC)?

Definition of congruent triangles

Which congruence postulate states that if two sides and the included angle of one triangle are congruent to two sides and the included angle of another triangle, then the triangles are congruent?

SAS Congruence Postulate

Which congruence postulate states that if three sides of one triangle are congruent to three sides of another triangle, then the triangles are congruent?

SSS Congruence Postulate