Question

In ∆ABC, ∟A + ∟B = 180⁰ - ∟C
true or false

Answer 1

Step-by-step explanation:

Let us suppose the angles ∠P, ∠Q, ∠Rof a ∆PQR be x°, (x - 20)°, (x - 40)° respectively.

∠P + ∠Q + ∠R = 180∘ (Angle sum property)

⇒ x∘ + (x - 20)° + (x - 40)° = 180∘

⇒ 3x - 60 = 180

⇒ 3x = 240

⇒ x = 80

Therefore,

∠P = 80∘

∠R = (80 - 20)°

= 60∘

∠R = (80 - 40)°

= 40∘

Hence, the measure of each angle is 80∘, 60∘ and 40∘respectively.

Answer 2

Answer:

yes the equetion is correct

Step-by-step explanation: