Number of Triangles Contained in a Polygon
We will learn how to find the number of triangles contained in a polygon.
If the polygon has ‘n’ sides, then the number of triangle in a polygon is (n – 2).
|
In a triangle there are three sides. In the adjoining figure of a triangle ABC we can observe that the number of triangles contained = 3 – 2 = 1. |
 |
|
In a quadrilateral there are four sides. Number of triangles contained in a quadrilateral = 4 – 2 = 2. In the adjoining figure of a quadrilateral ABCD, if diagonal BD is drawn, the quadrilateral will be divided into two triangles i.e. ∆ABD and ∆BDC. |
 |
|
In a pentagon there are five sides. Number of triangles contained in a pentagon = 5 – 2 = 3.
In the adjoining figure of a pentagon ABCDE, on joining AC and AD, the given pentagon is divided into three triangles i.e. ∆ABC, ∆ACD and ∆ADE. |
 |
|
In a hexagon there are six sides. Number of triangles contained in a hexagon = 6 – 2 = 4. In the adjoining figure of a hexagon ABCDEF, on joining AC, AD and AE, the given hexagon is divided into four triangles i.e. ∆ABC, ∆ACD, ∆ADE and ∆AEF. |
 |
● Polygons
Polygon and its Classification
Interior and Exterior of the Polygon
Number of Triangles Contained in a Polygon
Angle Sum Property of a Polygon
Problems on Angle Sum Property of a Polygon
Sum of the Interior Angles of a Polygon
Sum of the Exterior Angles of a Polygon
7th Grade Math Problems
8th Grade Math Practice
From Number of Triangles Contained in a Polygon to HOME PAGE
Didn't find what you were looking for? Or want to know more information about Math Only Math. Use this Google Search to find what you need.
Recent Articles
-
Worksheet on 8 Times Table | Printable Multiplication Table | Video
Mar 18, 25 03:30 PM
Worksheet on 8 times table can be printed out. Homeschoolers can also use these multiplication table sheets to practice at home. -
Worksheet on Roman Numerals |Roman Numerals|Symbols for Roman Numerals
Mar 18, 25 02:47 PM
Practice the worksheet on roman numerals or numbers. This sheet will encourage the students to practice about the symbols for roman numerals and their values. Write the number for the following: (a) V… -
Conversion of Roman Numeration | Roman Numerals |Hindu Arabic Numerals
Mar 18, 25 02:12 PM
We will learn the conversion of Roman numeration. First we will learn how to convert numbers in roman numerals. 1. Convert 579 in roman numerals. -
Rules of Roman Numeration |Roman Number System|Roman Numeration System
Mar 18, 25 09:41 AM
We will learn about Roman Numeration and its rules. We know that there are seven basic Roman Numerals. They are I, V, X, L, C, D and M. These numerals stand for the number 1, 5, 10, 50, 100, 500 -
Divisible by 2 | Test of Divisibility by 2 |Rules of Divisibility by 2
Mar 17, 25 04:04 PM
A number is divisible by 2 if the digit at unit place is either 0 or multiple of 2. So a number is divisible by 2 if digit at its units place is 0, 2, 4, 6 or 8.
● Polygons - Worksheets
Worksheet on Polygon and its Classification
Worksheet on Interior Angles of a Polygon
Worksheet on Exterior Angles of a Polygon
New! Comments
Have your say about what you just read! Leave me a comment in the box below. Ask a Question or Answer a Question.