Answer:
16 units
Explanation:
you need to find the areas separately
by splitting triangle into the two smaller ones shown
but you need to workout the individual lengths
for this use Pythagoras' thereom: a^2+b^2=c^2
so ya blah blah blah you get 5 squared - 4 squared equals 9
and sqaure root that you get 3
now find area of individual triangles so 4 times 3 =12 divided by 2 is 6
and then the other one so 8-3=5
5 times 4=20 divide by 2 =10
so the total area is 10+6=16