An isosceles triangle has a side of length 10 and a side of length 4. What are all possible perimeters of the triangle?
It is an isosceles triangle so the equal sides must be 10 or 4.
10 + 10 + 4 = 24.
20 > 4.
4 + 4 + 10 = 18.
8 is not > 10 thus it is not a triangle.
The perimeter is 24.
If you don't understand anything feel free to ask!