Use the formula for the perimeter of the.
\The perimeter P of a triangle is given by the formula P = a + b + c.
\The perimeter P of a triangle is
\P = (5.8 m + 4.2 m + 6.3 m) (Substitute: )
= 16.3 m (Add: 5.8 + 4.2 + 6.3 = 16.3)
Perimeter of triangle is P = 16.3 m.