Geometry Definitions and Types of Polygons

These flashcards cover key definitions and types of polygons and triangles, aiding in understanding basic geometry concepts.

Polygon

A closed shape with straight sides.

Examples include triangles, squares, and hexagons.

Triangle

A polygon with three sides.

There are different types of triangles: equilateral, isosceles, and scalene.

Equilateral Triangle

A triangle with three equal sides and three equal angles, each measuring 60 degrees.

Isosceles Triangle

A triangle that has two equal sides and two equal angles.

Scalene Triangle

A triangle with three sides of different lengths and three different angles.

Quadrilateral

A polygon with four sides and four angles.

Examples include: squares, rectangles, and trapezoids.

Square

A quadrilateral with four equal sides and four right angles (90 degrees).

Rectangle

A quadrilateral with four right angles and opposite sides that are equal in length.

Rhombus

A quadrilateral with four equal sides.

The opposite angles are equal, but the angles are not 90 degrees like a square.

Parallelogram

A quadrilateral with opposite sides that are parallel and equal in length, and opposite angles are equal.

Pentagon

A polygon with five sides and five angles.

Hexagon

A polygon with six sides and six angles.

Regular Polygon

A polygon with all sides and all angles equal.

For example, a regular pentagon has 5 equal sides and 5 equal angles.

Octagon

A polygon with eight sides and eight angles.

Trapezoid

A quadrilateral with at least one pair of parallel sides.

Right Triangle

A triangle with one right angle (90 degrees).

Acute Triangle

A triangle where all angles are less than 90 degrees.

Obtuse Triangle

A triangle where one angle is greater than 90 degrees.