Hey!!
Total angle - 180
... 2x + 4 + 2x - 9 + x = 180
... 4x - 5 + x = 180
... 5x - 5 = 180
... 5x = 185
... x = 185 / 5
... x = 37
Hope my answer helps!!
Bonjour,
answer ≈ 522.92
working
A= 2πrh+2πr^2
=2 x π x 4 x 18+2 x π x 4^2
≈552.92031
X=8
Here my
Work message me if u have questions