Given a(-3,6) and b(5,-6) find the distance and midpoint between each

What is the length of the unknown leg in the right triangle ?

Identify the converse of the following conditional: if a point is in the first quadrant, then its coordinates are positive. if the coordinates of a point are not positive, then the point is not in the first quadrant. if the coordinates of a point are positive, then the point is in the first quadrant. if a point is in the first quadrant, then its coordinates are positive. if a point is not in the first quadrant, then the coordinates of the point are not positive.

This is about circle theorems. someone asap : (