Question

answered in briefly of this sum​

Answer 1

Step-by-step explanation:

angle a + angle ade + angle x = 180°

{ angle sum property of a triangle}

40°+60°+x=180°

x=180°-100°

angle x=80°

angle x = angle z = 80°

{ DE||BC -> angle aed = angle acb. Basic Proportionality Theorem of a triangle }

angle y = angle ade = 60°

{ DE||BC -> angle ade = angle abc. BPT }