at a vertex
angle falls is the largest waterfall in the world by dc
it is at a vertex that is what would make sence
at an angle
1995
no one
November 16, 1933
The angle of reflection is equal to the angle of incidence when a ray of light falls normally on a plane mirror. This means that the light ray will be reflected back at the same angle at which it struck the mirror.
Assuming you meant 'Angel' falls - it's freshwater.
On the (south) American continent
Angel Falls is in the Canaima National Park, Venezuela
Angel Falls, the worlds tallest known waterfalls are in Venezuela, in South America.
An 80 degree angle is an acute angle. Any angle measurement that falls below 90 is acute while anything above is obtuse.