Classifying shapes

A triangle is a polygon with three sides and three angles.

1. Equilateral Triangle: All sides are equal. 2. Isosceles Triangle: Two sides are equal. 3. Scalene Triangle: All sides are different.

1. Acute Triangle: All angles are less than 90 degrees. 2. Right Triangle: One angle is exactly 90 degrees. 3. Obtuse Triangle: One angle is greater than 90 degrees.

A quadrilateral is a polygon with four sides.

1. Square: All sides are equal and all angles are 90 degrees. 2. Rectangle: Opposite sides are equal and all angles are 90 degrees. 3. Rhombus: All sides are equal but angles are not 90 degrees. 4. Parallelogram: Opposite sides are equal and parallel.

A parallelogram is a quadrilateral with opposite sides that are equal and parallel.

A trapezoid is a quadrilateral with at least one pair of parallel sides.

An equilateral triangle is a triangle where all three sides are of equal length.

An isosceles triangle is a triangle with at least two sides of equal length.

A scalene triangle is a triangle where all three sides are of different lengths.