Answer:
c
Step-by-step explanation:
x=80
since the intercepting arc of x is 160, then you divide 160 by 2, and get x.
81 is 3^4, so
90 (angle in a semicircle)
138.248cm²
Surface area=2πrh + 2πr²
Surface area=2x3.142x2x9+ 2x3.142x2²
Surface area=113.112+25.136
Surface area=138.248cm²