Answer:
9.42 m
Step-by-step explanation:
Arc AB = 2πr x (45/360)
= (2 x 3.14 x 12) / 8
= 9.42
$14
80% of $70 is $14, saving him $56
Volume: 41.643
Surface area: 119.04 (nearest tenth... I don't know...sorry)
I didn't know if you need volume or surface area so you got both!
