105 LearnersLast updated on June 23rd, 2025
Perimeter Of A Triangle Calculator
A calculator is a tool designed to perform both basic arithmetic operations and advanced calculations, such as those involving geometry. It is especially helpful for completing mathematical school projects or exploring complex mathematical concepts. In this topic, we will discuss the Perimeter Of A Triangle Calculator.
What is the Perimeter Of A Triangle Calculator
The Perimeter Of A Triangle Calculator is a tool designed for calculating the perimeter of a triangle.
A triangle is a three-sided polygon, and its perimeter is the sum of the lengths of all its sides. Triangles can vary in shape, including equilateral, isosceles, and scalene.
The term "perimeter" comes from the Greek words "peri," meaning "around," and "metron," meaning "measure."
How to Use the Perimeter Of A Triangle Calculator
For calculating the perimeter of a triangle using the calculator, we need to follow the steps below:
Step 1: Input: Enter the lengths of all three sides.
Step 2: Click: Calculate Perimeter. By doing so, the side lengths we have given as input will get processed.
Step 3: You will see the perimeter of the triangle in the output column.
Tips and Tricks for Using the Perimeter Of A Triangle Calculator
Mentioned below are some tips to help you get the right answer using the Perimeter Of A Triangle Calculator.
Know the formula:
The formula for the perimeter of a triangle is ‘a + b + c’, where ‘a’, ‘b’, and ‘c’ are the lengths of the sides.
Use the Right Units:
Make sure the side lengths are in the right units, like centimeters or meters. The answer will be in linear units (like centimeters or meters), so it’s important to match them.
Enter correct Numbers:
When entering the side lengths, make sure the numbers are accurate. Small mistakes can lead to incorrect results.
Common Mistakes and How to Avoid Them When Using the Perimeter Of A Triangle Calculator
Calculators mostly help us with quick solutions. For calculating complex math questions, students must know the intricate features of a calculator. Given below are some common mistakes and solutions to tackle these mistakes.
Mistake 1
Rounding off too soon
Rounding the side lengths too soon can lead to wrong results. For example, if the perimeter is 15.67 cm, don’t round it to 16 right away. Finish the calculation first.
Mistake 2
Entering the wrong number as a side length
Make sure to double-check the numbers you are going to enter as the side lengths. Entering an incorrect side length will give an incorrect perimeter.
Mistake 3
Mixing up side lengths
Ensure you enter the correct values for each side. Confusing one side with another can lead to incorrect results.
Mistake 4
Relying too much on the calculator
The calculator gives an estimate. Real objects may not be perfect, so the answer might be slightly different. Keep in mind that it's an approximation.
Mistake 5
Mixing up the positive and negative signs
Always check that you’ve entered the correct positive (+) or negative (–) signs. A small mistake, like using a negative sign for a side length, can completely change the result. Make sure the signs are correct before finishing your calculation.
Perimeter Of A Triangle Calculator Examples
Problem 1
Help Mary find the perimeter of a garden plot if its sides are 7 m, 8 m, and 10 m.
We find the perimeter of the garden plot to be 25 m.
Explanation
To find the perimeter, we use the formula: P = a + b + c
Here, the values of ‘a’, ‘b’, and ‘c’ are given as 7, 8, and 10 respectively.
Now, substitute the values in the formula: P = 7 + 8 + 10 = 25 m.
Problem 2
The sides of a triangular park are 12 m, 15 m, and 20 m. What will be its perimeter?
The perimeter is 47 m.
Explanation
To find the perimeter, we use the formula: P = a + b + c
Since the sides are given as 12, 15, and 20,
we can find the perimeter as P = 12 + 15 + 20 = 47 m.
Problem 3
Find the perimeter of a triangle with side lengths 5 cm, 6 cm, and 9 cm. After finding the perimeter, add 15 cm to it.
We will get the sum as 35 cm.
Explanation
For the perimeter of a triangle, we use the formula ‘P = a + b + c’.
Perimeter of triangle = 5 + 6 + 9 = 20 cm.
Addition = perimeter of triangle + 15 = 20 + 15 = 35 cm.
Problem 4
The sides of a triangular field are 9 m, 14 m, and 22 m. Find its perimeter.
We find the perimeter of the triangular field to be 45 m.
Explanation
Perimeter = a + b + c = 9 + 14 + 22 = 45 m.
Problem 5
Jake wants to set up a triangular pen for his pets. If the sides of the pen are 13 m, 18 m, and 24 m, help Jake find its perimeter.
The perimeter of the triangular pen is 55 m.
Explanation
Perimeter of triangular pen = a + b + c = 13 + 18 + 24 = 55 m.
FAQs on Using the Perimeter Of A Triangle Calculator
1.What is the perimeter of a triangle?
2.What happens if the side length is entered as ‘0’?
3.What will be the perimeter of a triangle if the side lengths are 4, 5, and 6?
4.What units are used to represent the perimeter?
5.Can we use this calculator for other polygons?
Important Glossary for the Perimeter Of Triangle Calculator
- Perimeter: It is the total distance around a two-dimensional shape. It is measured in linear units like meters (m) or centimeters (cm).
- Triangle: A polygon with three edges and three vertices. Side Length: The length of one side of a triangle.
- Linear Units: Units used to measure length, such as meters (m) and centimeters (cm).
- Polygon: A plane figure with at least three straight sides and angles, typically with more than three sides.
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Seyed Ali Fathima S
About the Author
Seyed Ali Fathima S a math expert with nearly 5 years of experience as a math teacher. From an engineer to a math teacher, shows her passion for math and teaching. She is a calculator queen, who loves tables and she turns tables to puzzles and songs.
Fun Fact
: She has songs for each table which helps her to remember the tables
