Let's go:
7 = x
38 + x = 180
x = 180 - 38
x = 142°
7 = 142°
I hope I helped you
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
1/2×80×16=640
answer------>>>>640cm^2
