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it is called an obtuse angle - well im pretty sure
A right angle is 90 degrees.
Yes, there is a 45 degree angle, and it is known as an acute angle.
Sine(pi/2) = 1 This is 'Radian' measure of an angle. pi/2 radians = 90 degrees. When you see something like 'Sine(pi/2)' make sure your calculator is in RADIAN mode. ' NOT degree mode.
Greater than 90 degrees but less than 180 degrees.