List of 2D shapes

Triangle is a polygon with the least number of sides and is also classified into six categories based on sides and angles. The names of different triangles are:

• Scalene triangle (All sides are unequal in length)
• Isosceles triangle (Any two sides are equal in length)
• Equilateral triangle (All the three sides are equal in length)
• Acute-angled triangle (All the three interior angles are less than 90 degrees)
• Obtuse-angled triangle (Any one of the three interior angles is more than 90 degrees)
• Right-angled triangle (Any one of the three interior angles is exactly equal to 90 degrees)

Types of Quadrilaterals

A quadrilateral is a four-sided, two-dimensional, closed shape. It is also called a four-sided polygon. It is categorized into different categories, such as:

• Square (All four sides are equal and all interior angles are equal to 90 degrees)
• Rectangle (Opposite sides are equal and parallel to each other, interior angles are equal to 90 degrees)
• Parallelogram (Opposite sides are equal and parallel)
• Rhombus (All sides are equal and diagonals bisect at 90 degrees)
• Kite (Adjacent sides are equal and diagonals intersect at 90 degrees)
• Trapezium (Only one pair of opposite sides are parallel)