This chapter introduces basic concepts and terms related to geometry.
A line is made up of an infinite number of points, and a plane is made up of an infinite number of lines.
Different types of angles: acute angles (less than 90 degrees), obtuse angles (greater than 90 degrees but less than 180 degrees), right angles (exactly 90 degrees), and straight angles (exactly 180 degrees).
Triangles: A triangle is a closed figure formed by three line segments.
Types of triangles: based on their sides (scalene, isosceles, and equilateral) and angles (acute, obtuse, and right).
Quadrilaterals: A quadrilateral is a closed figure formed by four line segments.
Different types of quadrilaterals: squares, rectangles, parallelograms, rhombuses, and trapeziums.