### Home > CALC > Chapter Ch12 > Lesson 12.1.4 > Problem 12-47

12-47.

Since *e ^{x}* > –2

*for all*

^{x}*x*, the diameter of the base will be (

*e*– (–2

^{x}*)).*

^{x}For a semicircular region, *A* = 0.5*πr*^{2}.

12-47.

Since *e ^{x}* > –2

For a semicircular region, *A* = 0.5*πr*^{2}.