Area of a circle is pi x r ^2
R = diameter/2
R = 1.8/2 = 0.9
Area = 3.142 x 0.9^2
Area = 2.5 square cm.
Not sure about the summer part, but the answer should be 1 / 6. Maybe your question is wrong.
The square root of -18 is 3i√
2
Hope this helps
I think 8.0 is the answer
