Rahim is constructing a proof to show that the opposite angle of a quadrilateral in a circle are supplementary what step would be the first in his proof

First step to  prove that opposite angle of a quadrilateral in a circle are supplementary is to find the intercepted arc of opposite angles of cyclic quadrilateral.

Step-by-step explanation:

Cyclic quadrilateral:

Cyclic quadrilateral is a  quadrilateral which lie on a circle.

As shown in figure, ABCD is a cyclic quadrilateral. First step to show that the opposite angle of a quadrilateral ABCD in a circle are supplementary is to find the intercepted arc of opposite ∠A and ∠C of cyclic quadrilateral.

as shown in figure intercepted are of ∠A is Arc(BCD) and intercepted arc of ∠C is Arc(DAB).

Therefore,

...................(1)

and

...................(2)

We Know that

..............(3)

Put values of Arc(BCD) and Arc(DAB) in equation (3)

.............(4)

Hence,

opposite angles and   of cyclic quadrilateral are supplementary.

the number of the people going.

step-by-step explanation:

the cost to buy one movie ticket is $7. if the total cost for the movie is a function of how many people go, then the input is : the number of the people going.