40×4×4=640
b=20 h=4
using formula:
1/2×base×height
1/2×20×4=40
its says scale by factor 4:
b=80 h=16
using formula:
1/2×base×height
1/2×80×16=640
answer------>>>>640cm^2
799, 499, and 191. (I got it off the textbook online.)
0.9<span>% of </span>603<span> = 5.43
so estimated is 5.40</span>
