S=πr^2* 1/4

=3. 14*36* 1/4

= 1 13.04* 1/4

=28.26

So the sector area is 28.26.

S△=6*6÷2

= 18

The triangle area is 18.

28.26- 18= 10.26

So the shadow area is 10.26cm.