- Adjacent Angle: Two Angles That Share A Common Side.
- Alternating Exterior Angle: In a Transversal, two opposite sides that equal each other outside the Transversal, are Alternating Exterior Angles.
- Alternating Interior Angle: In a Transversal, two opposite sides that equal each other inside the Transversal, are Alternating Interior Angles.
- Binomial: Two Terms, Consisting of Numbers and Variables, that are Multiplied Together.
- Complementary Angle: An Angle Measuring 90 Degrees.
- F. O. I. L.: A Method of multiplying two binomials, by multiplying in the order: F- First (First Term in each Binomial.), O- Outer (The First Term in the First Binomial and the Last Term in the Second Binomial.), I- Inner (The Last Term in the First Binomial, and the First Term in the Second Binomial.), and L- Last. (The Last Term in Each Binomial.)
- Monomial: A Single Term Consisting of a Number and Variable.
- Parallel Lines: A Pair of Lines, that are, an Equal Distance away from Each Other, That Goes On Forever, Without Intersecting.
- Polynomial: Any Amount of Terms Being Multiplied Together.
- Pythagorean Theorem: A Method of Finding out if the triangle is a Right Triangle, by using the Formula, and that When the two shorter legs, squared, are added up, it equals the Hypotenuse, squared, while the Hypotenuse is always larger than Leg A and Leg B.
- Pythagorean Theorem Formula: The Pythagorean Theorem Formula, is A² + B² = C², meaning Leg A Squared + Leg B Squared = Hypotenuse Squared.
- Pythagorean Triplets: When A, B, and C, meaning, Leg A, Leg B, or the Hypotenuse has a consecutive pattern, then It's called, Pythagorean Triplets.
- Right Angle: The Right Angle Measures 90 Degrees.
- Right Triangle: A Triangle that has a Right Angle, Measuring 90 Degrees.
- Straight Line: A Straight Line Measuring 180 Degrees.
- Supplementary Angle: An Angle Measuring 180 Degrees.
- Term: A Product of Numbers and Variables.
- Transversal: A Line Cutting Throught a Pair of Parallel Lines.
- Trinomial: Three Terms, Consisting of Numbers and Variables, that are Multiplied Together.
- Vertical Angle: Two Intersecting Lines That have opposite angles- One Angle Equals Its Opposite- A = B, C= D. The Two Angles Adjacent to Each Other, and are not Opoposite, to Each Other, add up to 180 Degrees, because it forms a Straight Line.