# Geometric Shapes: The Basics

# Geometric Shapes: The Basics

by Colleen Wagner
# 1. Regular Octagon: Polygon with eight sides of equal length.

## 1.1. This stop sign is an example of a regular octagon.

# 2. Regular Decagon: A polygon with ten sides of equal length.

## 2.1. This is an example of a regular decagon.

# 3. Quadrilaterals: A geometric shape with four sides and angles.

## 3.1. Parallelogram: Quadrilateral with opposite sides parallel.

### 3.1.1. The U.S. flag is an example of a parallelogram.

## 3.2. Trapezoid: Quadrilateral that has at least one pair of parallel sides.

### 3.2.1. This is an example of a trapezoid.

## 3.3. Kite: Quadrilateral with two distinct pairs of congruent adjacent lengths.

### 3.3.1. The kites we played with as children is a great example.

## 3.4. Square: Rhombus with a right angle.

### 3.4.1. This Rubik's Cube is an example of many squares.

## 3.5. Rhombus: Quadrilateral where all sides have equal length.

### 3.5.1. This is an example of a rhombus.

# 4. Triangles: Polygon with three sides and three interior angles.

## 4.1. Equilaterial Triangle: Polygon in which all three sides and three angles are congruent.

### 4.1.1. This crossing sign is an equilateral triangle.

## 4.2. Isosceles Triangle: Polygon where only two sides and two angles are congruent.

### 4.2.1. The roof of this house is an isosceles triangle.

## 4.3. Right Triangle: Polygon that has exactly one right angle.

### 4.3.1. This is an example of a right triangle.

# 5. Regular Hexagon: Polygon that has all six sides of equal length.

## 5.1. This is an example of a regular hexagon.

# 6. Pentagon: A polygon with five sides.

## 6.1. This soccer ball has examples of pentagons.