Upgrade subject to access all content

What is the area of the shaded sector of the following circle?

Eric Istre. Created for Albert.io. Copyright 2016. All rights reserved.

$7.1 {\text{ cm} }^{ 2 }$

$42.4{\text{ cm} }^{ 2 }$

$14.1{\text{ cm} }^{ 2 }$

$15,268.1{\text{ cm} }^{ 2 }$