Answer:
[tex]y = 180 - 2x[/tex]
Step-by-step explanation:
Required
Triangle: Isosceles
Required
An expression for the third side
Let the equal sides be x and the third side be y
From triangle sum theorem, we have the following expression:
[tex]x + x + y = 180[/tex]
[tex]2x + y = 180[/tex]
Subtract 2x from both sides
[tex]-2x +2x + y = 180 - 2x[/tex]
[tex]y = 180 - 2x[/tex]
Hence, the third side of an isosceles triangle is: [tex]y = 180 - 2x[/tex]
