# CCSS IP Math I 1.1.2 Example 2

- Topic:
- Perimeter

To calculate the perimeter of an isosceles triangle, the expression 2

*s*+*b*is used, where*s*represents the length of the two congruent sides and*b*represents the length of the base. What effect, if any, does increasing the length of the congruent sides have on the expression?- Refer to the expression given: 2
*s*+*b*. - If the value of the congruent sides,
*s*, is increased, the product of 2*s*will also increase. Likewise, if the value of*s*is decreased, the value of 2*s*will also decrease. - If the value of
*s*is changed, the result of the change in the terms is a doubling of the change in*s*while the value of*b*remains the same.