# Base of an isosceles triangle

Calculate the size of the base of an isosceles triangle, the height is 5 cm, and the arm's length is 6.5 cm. What is the perimeter of this triangle?

## Correct answer:

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Calculation of an isosceles triangle.

See also our trigonometric triangle calculator.

Do you want to convert length units?

Calculation of an isosceles triangle.

See also our trigonometric triangle calculator.

### You need to know the following knowledge to solve this word math problem:

**algebra**- expression of a variable from the formula
**planimetrics**- Pythagorean theorem
- right triangle
- perimeter
- triangle

### Units of physical quantities:

### Grade of the word problem:

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