Question

An isosceles triangle is one which has two sides of equal length. How many different isosceles triangles of perimeter 25 units can be formed with all sides having lengths that are whole numbers?

Answer 1

12 isoceles triangles

Explanation:

2x + y = 25

x y

12 1

11 3

10 5

9 7

8 9

7 11

6 13

5 15

4 17

3 19

2 21

1 23