Math K-Plus

Perimeter Of Isosceles Triangle Calculator

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How To Find The Perimeter Of An Isosceles Triangle?

Let's look at the geometric characteristics of a isosceles triangle. But first please review the definition of Perimeter Of Two-Dimensional Shapes, Angle and Right Angle.
  • An isosceles triangle has two unique features.
  • The first unique feature is two sides have exactly the same length: sides A.
  • The second unique feature the angles at the base of the triangle are exactly the same. In other words ∠BA and ∠AB are equal. The sum of the interior angles is 180°.
  • Special note, all sides of an isosceles triangle must be greater than zero.

Perimeter Of An Isosceles Triangle Formula
Formula = Side A + Side A + Side B =
Formula = 2 A + B =
Formula = (2 × A) + B

Formula = Side A + Side B + Side C =
Formula = A + B + C

Isosceles Triangle

Perimeter Of An Isosceles Triangle Calculator
Field Name User Input
Length Of A
You can enter up to 6 digits
Length Of B
You can enter up to 6 digits
Your Answer
You can enter up to 10 digits
Correct Answer

Generate a new Perimeter Of A Isosceles Triangle of a Isosceles Triangle problem for the student to solve.