Question

http://prntscr.com/6d5fmk

Answer 1

Formula:\[A = \pi r^2 / 2\]

Answer 2

\[Radius = Diamter / 2\]

Answer 3

\[21/2 = 10.5\]

Answer 4

Now we substitute what we know:\[A = 3.14*10.5^2/2\]

Answer 5

\[10.5^2 = 110.25\]

Answer 6

\[A = 3.14*110.25/2\]

Answer 7

What do you get ^

Answer 8

@KendrickLamar2014 173