One example would be a twin lens reflex, such as the Mamiya C220. You hold the camera at a level where you can look straight down into the viewfinder, which is on top. I believe that's what you are referring to. They do, or did, make an optional prism attachment so that viewing is more like an SLR. But without that you must look down.
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Because a right angle is a right angle.
Assuming your question is what makes a right-angle, it is an angle of 90o .
because a right angle is right and a left angle is wrong
A right angle. i think it's a right angle
The side opposite the right angle of a right angle triangle is the hypotenuse