If two angles are obtuse, then they must be congruent?

true or false???

If two angles are supplementary, then they must form a straight angle.  If two angles are obtuse, then they can be vertical angles.  If two angles are vertical angles, then they will always be congruent.

Step-by-step explanation:

answer: option a.

step-by-step explanation:

you know that the quadrilateral opqr ( a four sided figure) is inscribed in circle. this means that all its vertices are on the circle.

then, by definition, the opposite angles of the quadrilateral are supplementary, this means that the sum of their measures is 180 degrees.

you can observe in the figure that the angles ∠opq   and the angle ∠orq   are opposite, therefore:

then, can be used to d to calculate the measure of ∠opq