Question

how could I gee t the answer to triangle:base=13.5 in., height=6.4 in.

Answer 1

you multiply the base by the height then divide your answer by two. so your answer would be 43.2

Answer 2

The area of a triangle is explained by $A_{triangle}=\frac{1}{2}base*height$

So if you plug in the given values:

$A_{triangle}=\frac{1}{2}13.5*6.4 = 43.2$

So the answer is 43.2in$^{2}$