NCERT Class 9 Solutions: Line and Angles (Chapter 6) Exercise 6.3 – Part 1
Figure of Interior angle
Q1 In the figure, sides QP and RQ of are produced to points S and T respectively. If and , find .
Solution:
Given, sides QP and RQ

Now, (SQ is a straight line.)

also, (TR is a straight line.)

Now, (Sum of the interior angles of the triangle.)
Q2 In the figure, If YO and ZO are the bisectors of and respectively of , find and
Solution:
Given,
YO and ZO are the bisectors of and respectively.

Now,
(Sum of the interior angles of the triangle)

Now,∠OZY = 1/2∠XZY (ZO is the bisector.)

Also, (YO is the bisector.)

Now, (Sum of the interior angles of the triangle.)