Final answer:
The perimeter of an isosceles triangle is the sum of its three sides: two equal sides (denoted as 'a') and the base ('b'). It is expressed as P = 2a + b, using linear units for measurement.
Step-by-step explanation:
To write the perimeter of an isosceles triangle in simplest form, we must know the lengths of the sides. An isosceles triangle has two sides of equal length and a base that may be of a different length. However, without specific lengths provided, we can denote the equal sides as 'a' and the base as 'b'.
The perimeter of an isosceles triangle is found by adding the lengths of all three sides: P = a + a + b, which simplifies to P = 2a + b. It is important to remember that all lengths must be in the same units to correctly calculate the perimeter.
If any of the sides are given in terms of square units or cubic units instead of linear units, that would be an error because perimeter is a one-dimensional measurement and must be expressed in linear units, such as meters or feet.