Question 1 of 100

The figure below is not drawn to scale. PQR is an isosceles triangle. PRS is a straight line. $\angle$PRS =70$^\circ$ and $\angle$TRS=80$^\circ$. Find the sum of $\angle$a, $\angle$b and $\angle$c.

Question Image of The figure below is not drawn to scale. PQR is an isosceles triangle. PRS is a straight line. $\angle$PRS =70$^\circ$ and $\angle$TRS=80$^\circ$. Find the sum of $\angle$a, $\angle$b and $\angle$c.  .
A
155$^\circ$
B
157$^\circ$
C
169$^\circ$
D
161$^\circ$
E
None of the above