The perimeter of a triangle is 25 cm. Two of its sides measure 4 cm and 10 cm. Find the length of the third side.

11cm

Perimeter of triangle is given by formula;P = X + Y + Z
Substitutes the values
P=X+Y+Z
25=10+4+Z
Rearrange Z+14=25
Z=25-14 Z=11
Therefore the length of third side is 11cm.