Question

if pq || St , PQR =100° and RST =140° find QRS​

Answer 1

Answer:

QRS=60°

Step-by-step explanation:

Given that: angle PQR=100°

angle RST=140°

angle QRS=?

solve: angle PQR+ angle RST+angle R=360°(exterior angle property)

→100°+140°+R=360°

→240°+R=360°

→R=360°-240°

→R=120°

angle QRS+angle R=180°

QRS +120°=180°

QRS=180°-120°

QRS=60°