There is a circle c, whose diameter has endpoints a and p. circle c has a secant line that intersects it at points q and p. the circle also has a tangent at a point t, and one of its radii extends from the center to the point of tangency. in addition, there is an inscribed angle composed of rays extending from p to a and from p to q. there is also a central angle composed of segments extending from c to t and from c to w. circle c also contains a chord with endpoints at a and q