In a seminar, the number of participants in german, english and french are 204, 120 and 168 respectively. find the numbers of rooms required to house them if in each room, the same number of participants are to be accommodated and all of them must belong to the same language.

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