Question

If in a triangle ABC , ∠B is 40° and ∠C is 60° then the measure of ∠A is:​

Answer 1

Answer:

let the angle be x

40x+60x=360

100x= 360°

x=360 -100

x=260°

Step-by-step explanation:

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Answer 2

Answer:

∠A= 80°

Step-by-step explanation:

In a triangle, the sum of internal angles is 180° [Angle Sum Property]

Now,

∠A + ∠B + ∠C = 180°

∠A + 40° + 60° = 180°

∠A + 100° = 180°

∠A = 180° - 100° = 80°

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