LEARN MATH

Math Trivia

📍I am the set that contains every element under discussion. What am I?

A. Universal Set
B. Disjoint Set
C. Joint Set
D. Intersection

Math Trivia Question
📍What is the ONLY EVEN Prime number?

✅ Grade 8 Math Terms (1–25) with Definitions

1. Integer
A whole number that can be positive, negative, or zero.

2. Rational Number
A number that can be expressed as a fraction (a/b) where a and b are integers and b ≠ 0.

3. Irrational Number
A number that cannot be written as a simple fraction. Its decimal goes on forever without repeating (e.g., √2, π).

4. Real Number
All rational and irrational numbers combined.

5. Exponent
A number that tells how many times to multiply the base by itself (e.g., 3² = 3 × 3 = 9).

6. Scientific Notation
A way of writing very large or small numbers using powers of 10 (e.g., 4.2 × 10³ = 4200).

7. Square Root
A number which, when multiplied by itself, gives the original number (e.g., √16 = 4).

8. Linear Equation
An equation that makes a straight line when graphed (e.g., y = 2x + 1).

9. Slope
A measure of steepness of a line, defined as rise over run (change in y / change in x).

10. Y-intercept
The point where a line crosses the y-axis (when x = 0).

11. Function
A relation where each input (x) has only one output (y).

12. System of Equations
A set of two or more equations with the same variables.

13. Inequality
A mathematical sentence that compares two values using symbols like >,

Polygons – Grade 7 Math Terms (1–25)

1. Polygon
A closed figure with three or more straight sides.

2. Side
A straight line segment that forms part of a polygon.

3. Vertex (Vertices)
A point where two sides of a polygon meet.

4. Angle
The space between two intersecting lines or surfaces at a vertex.

5. Interior Angle
An angle formed inside the polygon at a vertex.

6. Exterior Angle
An angle formed between one side of a polygon and the extension of an adjacent side.

7. Regular Polygon
A polygon with all sides and all angles equal.

8. Irregular Polygon
A polygon with sides and/or angles not all equal.

9. Convex Polygon
A polygon where all interior angles are less than 180° and no sides are pushed inward.

10. Concave Polygon
A polygon that has at least one interior angle greater than 180°.

11. Triangle
A polygon with 3 sides and 3 angles.

12. Quadrilateral
A polygon with 4 sides (e.g., square, rectangle, trapezoid).

13. Pentagon
A polygon with 5 sides.

14. Hexagon
A polygon with 6 sides.

15. Heptagon
A polygon with 7 sides.

16. Octagon
A polygon with 8 sides.

17. Nonagon
A polygon with 9 sides.

18. Decagon
A polygon with 10 sides.

19. Perimeter
The total length around a polygon (sum of all sides).

20. Area
The measure of space inside a polygon.

21. Diagonal
A line segment connecting two non-adjacent vertices of a polygon.

22. Scalene Triangle
A triangle with all sides of different lengths.

23. Isosceles Triangle
A triangle with two sides equal in length.

24. Equilateral Triangle
A triangle with all three sides equal.

25. Sum of Interior Angles
The total of all interior angles in a polygon, calculated using the formula
▶ (n – 2) × 180°, where n is the number of sides.