In Fig. 6.15, `/_P Q R=/_P R Q`, then prove that `/_P Q S=/_P R T`.

In Figure, /_P Q R=\ /_P R Q , then prove that /_P Q S=\ /_P R Tdot

In Fig. 4.99, if /_P=/_R T S , prove that R P Q ~ R T S . (FIGURE)

In Fig. 6.44, the side QR of PQR is produced to a point S. If the bisectors of /_P Q R and /_P R S meet at point T, then prove that /_Q T R=1/2/_Q P R .

In Fig. , the side QR of △ PQR is produced to a point S. If the bisectors of /_P Q R and /_P R S meet at point T, then prove that /_Q T R=1/2/_Q P R .

In Figure, P S=Q R\ a n d\ /_S P Q=/_R Q Pdot Prove that P Q S\ ~=\ Q P R ,\ P R=Q S\ a n d\ /_Q P R=\ /_P Q S

In Fig. 4.90, if P S|| Q R , prove that P O S ~ R O Q . (FIGURE)

In Fig. 4.90, if P O S ~ R O Q , prove that P S Q R . (FIGURE)

In Fig. 4.90, if P O S ~ R O Q , prove that P S Q R . (FIGURE)

In Fig. 6.44, the side QR of PQR is produced to a point S. If the bisectors of /_P Q R"\ "a n d/_P R S meet at point T, then prove that /_Q T R=1/2/_Q P R .

In Fig. 6.11, OP, OQ, OR and OS are four rays. Prove that /_P O Q+/_Q O R+/_S O R+/_P O S=360o