Triangle iequality: The sum of any two sides of a triangle is greater than or equal to the third side.
Use the theorem above to find if the given lengths can form a triangle:
[tex]\begin{gathered} 5+5\ge10 \\ 10\ge10 \\ \\ 5+10\ge5 \\ 15\ge5 \\ \\ 10+5\ge5 \\ 15\ge5 \end{gathered}[/tex]As you get true inequalities above, the sum of any two sides of the given triangle are greater than or equal to the third side. Given lengths form a triangle
