[b]1. The solid angle subtended by a 100 cm^2 circular detector at a distance of 1 m is ______steradians.
[b]2. Ω = A/r^2 and A =∏r^2 (area of a circle)
[b]3. I originally tried to find r by solving 100 = ∏r^2 and I got r = 5.6. I then tried to plug into the first equation for Ω only to...