find area of rectangle
find are a of triangle
rectanglearea-trialgnearea=areaofshadedreigon
rectanglearea=legnth times wdith
trianglearea=1/2 times base tiems height
rectangle is 13 by 8
area=13*8=104
trialgle area=
we need to find base
13-4-4=5
base=5
height=6
area=1/2 times 5 times 6=15
rectangle-traingle=104-15=89 m^2