Question

constructed ∆DEF in which EF=8 cm ,angle E= 70 degree and angle F= 80 degree find the measure of angle D​

Answer 1

Answer:

30 degrees

Step-by-step explanation:

sum of angles in a triangle = 180 degrees

70+80+x = 180

x = 30 degrees

Answer 2

Answer:

Step-by-step explanation:

By angle sum property

angle d + angle e+ angle f= 180°

⇒70°+80°+∠d=180°

⇒∠d= 180° - 150°

⇒∠d= 30°