As we know,

now, let's plug the given values to find a² + b²
Answer:
C. 238π cm^3.
Step-by-step explanation:
Surface area = 2 * area of the circular ends + area of the curved length
= 2π r^2 + 2π r* l
= 2 π 7^2 + 2π 7 * 10
= 98π + 140π
= 238π cm^3.
12,500 divide 1999, 12,500 divide 1998, etc hope this helps