The figure below is not drawn to scale, SP is parallel to TQ. PQR and STU are straight lines. Which one of the following statements is true?

\[\angle a-\angle b=180{}^\circ \]

\[\angle a-\angle c=180{}^\circ \]

\[\angle c+\angle d=180{}^\circ \]

The figure below is not drawn to scale, SP is parallel to TQ. PQR and

1.	The figure below is not drawn to scale, SP is parallel to TQ. PQR and STU are straight lines. Which one of the following statements is true?
A.	\[\angle a-\angle b=180{}^\circ \]
B.	\[\angle a-\angle c=180{}^\circ \]
C.	6
D.	\[\angle c+\angle d=180{}^\circ \]
E.	None of these
Answer» E. None of these