Two sides of a triangle measures 25 cm + 35 CM which of the following would be the measure of the third side

Assuming those are the legs of the triangle and that you need to find the hypotenuse ... I would use the formula: a^2+b^2=c^2

It doesn't matter what a and b are, just fill it in.

25^2+35^2=c^2

625+1225=c^2

1850=c^2

Take the square root of 1850, it isn't a perfect square so I got: 43.01.

If you want, just round it to 43, idc.

So, if I were to check my work, I would need to remember that the hypotenuse is the longest side.

Since 43 is the hypotenuse, it is the longest side.