Question

rashi measured two sides of a triangle and found them to be 4cm and 9cm. What is the third side?

Answer 1

let the third side be x. we know that the sum of any two side is greater than third. :. (4+9)>x=x <13. Also, we know that the difference of any two side of a triangle is less than third. :. (9-4)<x=x <5. thus 2 <x <13. hence the third side must be larger than 5cm and smaller than 13cm.