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They mean that the expression to the left of the sign is greater than or less than (as appropriate) the expression to the right of the sign.
Acute angles are greater than 0 but less than 90 degrees Obtuse angles are greater than 90 but less than 180 degrees Reflex angles are greater than 180 degrees but less than 360 degrees
it is due to the fact that the length of an inclined plane(effect arm) is greater than its vertical height(load arm).
195 is greater than 180, but less than 270 so it is in quad 3
Sine and cosine cannot be greater than 1 because they are the Y and X values of a point on the unit circle. Tangent, on the other hand, is sine over cosine, so its domain is (-infinity,+infinity), with an asymptote occurring every odd pi/2.