An angle is the measurement of two lines drawn from the centre of a circle. A circle is 380 degrees. So in an angle of 90 degrees, one line would be vertical at 0 degrees, and the second line would be horizontal at 90 degrees. So the relationship is that you can't have one without the other.
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The tangent secant angle is the angle between the tangent to a circle and the secant, when the latter is extended.
In a circle what is the difference between a central angle and an arc?Read more: In_a_circle_what_is_the_difference_between_a_central_angle_and_an_arc
The circle is the reflex angle, the square means it's a right angle.
It is a right angle
they both measure the angle in degrees