csc = 1/sin
csc (74o) = 1/sin(74o) = 1/0.9613 = 1.0403
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cosec(30) = 2 if the angle is measured in degrees.
A 45-degree angle is an acute angle
A 90 degree angle is a right angle
If the triangle has a 30 degree angle and a 60 degree angle then the 3rd angle must be a 90 degree angle because there are 180 degrees in a triangle and so therefore it is a right angle triangle.
An angle greater than 90 degree is an obtuse angle.