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Elementary geometry is a branch of mathematics that deals with the properties and relationships of basic geometric figures such as points, lines, angles, triangles, circles, and polygons. It lays the foundation for more advanced geometrical concepts and is typically one of the first areas of geometry studied in school. Key concepts in elementary geometry include: 1. **Points and Lines**: The fundamental building blocks of geometry.

Elementary number theory is a branch of mathematics that deals with the properties and relationships of integers, particularly through the study of whole numbers and their inherent properties. It focuses on various topics related to numbers, notably primes, divisibility, modular arithmetic, and congruences, without requiring advanced mathematics or tools from other areas.