एक कथन जिसे आमतौर पर इसलिए सत्य मान लिया जाता है क्योंकि वह बिना किसी प्रमाण के स्वतः स्पष्ट होता है, कहलाता है:

If B is the center of a circle and lines AD and CD are tangent segments drawn from an external point D, then which of the following classifications apply to quadrilateral ABCD? (a) Kite (b) Cyclic quadrilateral (c) Rhombus (d) Trapezium

In a parallelogram PQRS, rays PA and SA are the angle bisectors of ∠QPS and ∠RSP respectively. Find the measure of ∠PAS.