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What is the purpose of the helix angle in relation to aeroplane propellers?
maximum thrust is obtained.
Is an angle be negative?
Yes. Sometimes in mathematics, it is useful to have negative angles. You can increase or decrease an angle by 360 degrees (or 2*pi radians) without changing the characteristics of the angle. Thus, for example, an angle of 30 degrees is equivalent to an angle of -330 degrees.
Can an angle be negative in trigonometry?
no because the only way degrees can be negative is in temperature.
What does it mean when an angle is negative?
An angle is a measure of turn. the amount of turn is the magnitude, measured in degrees, and direction of turn can be clockwise or anti-clockwise. A positive angle turns in an anti-clockwise direction while a negative angle turns in a clockwise direction.
Can angle measurements be negative?
Yes, although it may seem strange. Conventionally, on a Cartesian plane, angles are measured in an anticlockwise dirction, from the x-axis. Consequently, an angle in the clockwise direction could be considered a negative angle. It might be simpler to think of an angle of 359 degrees as one of -1 degrees, instead. Sometimes you need to subtract one angle from another and in that context, a negative measure for the angle is implicit.
