When we draw a circle with the centre at D and have a tangent HF to the circle D at point E, the angle DEF will be a right angle.
In other words angle DEF = 90 degrees
Since HF, the tangent, is a straight line, the other angle DEH should also be = 90 degrees because the straight line has an angle of 180 degrees
Therefore angle DEF = angle DEH = 90 degrees
Therefore, angle DEF is congruent to angle DEH (Option A)
if you multiplying or dividing different sign, then the product is negative.
otherwise if you multiplying or dividing same sign, then the product is positive.
but if you multiplying or dividing 0 with non-zero, the product always 0
Thanks for helping!!