Triangle Calculator: Determine the Area of a Triangle and explain what is a 3-4-5 ratio of a triangle

Triangle Calculator: Determine the Area of a Triangle and explain what is a  3-4-5 ratio of a triangle
4 min read

The Area in a Triangle is the space or area covered by a triangle in a two-dimensional plane.

Calculating the  Area of the Triangle is simple, and it is the same for Isosceles, scalene, and equilateral triangles. The triangle Calculator makes calculating the various factors of a triangle quite easy by dissolving the errors caused by manual calculation.


The base and height are perpendicular in each triangle.

Define the Area of a Triangle 

The area of a triangle is the area included in the enclosed sides of a triangle.  

The area for every triangle is not the same because the length, height, and internal angles vary for every triangle. You can use the Triangle Calculator to compute any triangle's area.

A triangle consists of three sides, angles, and vertices. Now there are different types of triangles classified as 

Equilateral Triangle 

Right Angled Triangle 

Isosceles Triangle 

How to determine the Area of a Triangle?

There are two methods to calculate/ compute the area of a triangle. The easiest way is to use the Triangle Calculator. Or the most widely used Formula being the Herons Formula. The important length of all the sides of a triangle is known before using Heron's Formula.

Area of a Triangle can be calculated with this  Formula 


What is a 3-4-5 triangle?

The 3-4-5 triangles are right-angled. One of the angles measures 90°.

These Triangles can be classified further depending on the angles or side lengths. They are either identified as 30-60-90 or 45-45-90.

Both are right-angled triangles having unique characteristics of side length and angle. You can use the Right angled triangle to calculate the sides and angles to determine if the ratio is 3-4-5.

What is The 3:4:5 Triangle Rule?

The 3:4:5 triangle Rule implies that the ratio of a triangle's sides or lengths is 3:4:5.

Now the same ratio can be used for triangles with similar angle measurements. Also, the Pythagorean theorem states that the total of the square of the two sides is equal to the total/sum of the square of the longest side/height.

Now the theorem is the easiest way to understand the 3-4-5 is a right-angled triangle. Or you can use the Right Angled Triangle Calculator to calculate the sides and angles.

Let's understand it with the following example.

So let's take the values as 3, 4 and 5 

So the Formula used in the Pythagorean Theorem is 





The Process to lay out a Right Angled Triangle or 3-4-5 triangle and the angles included in it.

Now the layout process starts by drawing or calculating the side length 3. Now if you are drawing, the other side is the adjacent side, also known as 4. Now the last side that connects 3 and 4 is 5. 

Now to get a decent picture and understand if it's a right-angled triangle. You can use the Right Angled Triangle Calculator to measure/calculate the sides and angles of the triangle.

Again if the triangle has a 3-4-5 as the constant ratio for its lengths, it is a right-angled triangle. The Pythagorean Theorem also justifies it, as it uses the side lengths of a triangle to calculate and prove it is a right-angled triangle.

The angles in the 3-4-5 ratio are usually the same. It is a right-angled triangle with an angle that measures 90°. 


The's  Triangle Calculator makes it quite easy to calculate the length, area,  perimeter, or any factor of a triangle. It is quite easy and simple compared to tedious formulas because the manual calculations may still need to be corrected.

In case you have found a mistake in the text, please send a message to the author by selecting the mistake and pressing Ctrl-Enter.
john son 2
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