An angle of 50 grads is equal to half a right angle or 45 degrees.

An angle of 100 grads is a vertical line, measured fro the horizontal, and is equal to a right angle.

Grad is not the same as gradient. A 1 in 2 gradient, or 50% gradient, means along 2 and up 1, and is equal toi

\[tan^{-1}(1/2)=26.57\]

degrees, or 29.52 grads.