In triangle pqr, p equals what.
1) (r sin p)/ sin q
2) (r sin p)/ sin r
3) (r sin r)/ sin p
4) (q sin r)/ sin q

The correct answer is 3.

The formula for the law of sines is the following:

P/sin P = Q/sin Q = R/sin R

So, if you break these up into two different equations, you will have: 

P/sin P = Q/sin Q and P/sin P = R/sin R

To solve, get P alone on one side of the equation by multiplying the other side by sin P:

P = Q sin P/sin Q and P = R sin P/sin R

When you look at the answers, you'll see that the second equation is an option.

Zero is the mid point of the line segment