Question 21780
The diameter can be determined by the Pythagorean Theorem 

{{{10^2+12^2=hyp}}}
hyp=15.6

Radius = 7.8
{{{(pi)*r^2}}}
{{{(pi)*7.8^2}}}
{{{(pi)*60.84}}}

=191.0376
Hence, the area for the circle is {{{191 cm^2}}}