Hint (a): hint (b): find the area of a circle πr2. notice that this is only three-fourths of a circle. hint (b): find the circumference of a circle (2πr). note that this is, again, three-fourths of a circle. once you find the adjusted circumference, remember to incorporate the radius of the straight edges in your calculations.] answer

correct answers below:

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