The perimeter of a square field whose side is 4 m is ........... m.
Find the third side of a triangle whose two sides are (3m2−5m) and (4m2+12) and perimeter is (8m2−9m+4).
Find the third side of a triangle whose perimeter is 8m2−9m+4 and two of its sides are 3m2−5m and 4m2+12.