Atriangle has an area of 54 m2 and a height of 9m how long is the base of the triangle entered your answer in the box

The first thing you should know to solve this problem is that the definition of the area of the triangle is:
 A =(1/2)* b * h
 Where,
 b: base
 h: height.
 Clearing the base we have:
 b = 2*A / h
 Substituting the values
 b = 2*(54) / (9) = 12 m
 
 The base of the triangle is 12m long