Ive asked this question 2 times already, .

don’t know how to find the area of this tri without the height.

 The area of the triangle is:  " 118.3 " m² .

Note:

Area of a triangle, "A":

A = (1/2) * b * h ; 

in  which:   b = base length ;
                   h = perpendicular height; 

A = (1/2) * (18.2 m) * (13 m) ; 

A = 118.3 m² .