Triangles Beginner

Master triangle fundamentals: basic concepts, side inequalities, classification, isosceles and equilateral features, angle sum, and area.

1. Basic Concepts & Stability

Definition, notation, and structural stability

2. Side Inequalities

Sum/difference inequalities for three sides

3. Classification

Acute/right/obtuse; scalene/isosceles/equilateral

4. Isosceles & Equilateral

Vertex/base angles; special properties of equilateral

5. Angle Sum Theorem

Triangle 180° sum and polygon extension

6. Area

Base-height formula; right and equilateral cases

🎯Practice Questions

Test your understanding with 15 single-choice questions

Practice triangle stability, side inequalities, classification, angle sum, and area with instant feedback and detailed explanations.

🧮Interactive Triangle Calculators

Practice with specialized calculators designed for triangle learning

These calculators complement your learning with hands-on practice of triangle concepts, formulas, and problem-solving.