The formula to calculate the area of a triangle is
[tex]A=\frac{b\times h}{2}[/tex]
the b is the base and h is the height
in this case
b= distance between D and E=13
h= distance between D and C=3
we substitute the values in the formula
[tex]A=\frac{13\cdot3}{2}=19.5u^2[/tex]
the area is 19.5 square units
