Isosceles Triangle Perimeter Table: Perimeter by Equal side length
Reference table of perimeter for Isosceles Triangle Perimeter across a range of equal side length values — exact, engine-computed figures you can read off at a glance.
Isosceles Triangle Perimeter Calculator
Verified formula Updated Jun 2026 Private — runs on your device
Verified formula
Private
Perimeter
16.0000
For general information only — not financial, tax, legal or medical advice. Verify before you rely on it.
How to use the Isosceles Triangle Perimeter Calculator
The Isosceles Triangle Perimeter Calculator works out your perimeter in an instant. Enter equal side length and base length and the result updates as you type — it is free, needs no sign-up, and runs entirely in your browser so your figures stay private.
- Enter the equal side length.
- Enter the base length.
- Read off your perimeter — the calculator updates automatically, with no button to press.
Formula
The Isosceles Triangle Perimeter Calculator uses the formula:
Perimeter = 2 × Equal side length + Base length
Worked example
For example, with equal side length of 5 and base length of 6, the perimeter is 16.0000.
| Equal side length | 5 |
|---|---|
| Base length | 6 |
| Perimeter | 16.0000 |
|---|
Results are estimates for educational use, not professional advice.
Key terms explained
- Perimeter
- The total distance around the outside of a two-dimensional shape.
Frequently asked questions
Add twice the equal side to the base: 2a + b. Equal sides of 5 with a base of 6 give a perimeter of 16.
A triangle with two sides of equal length and two equal base angles.
No. Perimeter needs only the side lengths, not the height.
Perimeter is the distance around; area needs the base and height.
The Isosceles Triangle Perimeter Calculator uses the formula: Perimeter = 2 × Equal side length + Base length. For example, with equal side length of 5 and base length of 6, the perimeter is 16.0000.
Enter the equal side length. Enter the base length. Read off your perimeter — the calculator updates automatically, with no button to press.
Related guides
How to Calculate Isosceles Triangle Perimeter: Formula, Steps & Examples
Learn how to calculate Isosceles Triangle Perimeter — the formula explained step by step, with worked examples and a free calculator to check your answer.