Question

In ∆ ABC; ∆ B = 75° and ∆C = 30°, find ∆ A.​

Answer 1

Answer:

∠A  = 75°

Step-by-step explanation:

given,

a  ∆ABC with ∠B = 75° and ∠C=30°

we know,

In any triangle, the sum of all three angles so formed will be equal to 180°

=> here, ∠A + ∠B +∠C = 180°

=> ∠A + 75° + 30° = 180°

=> ∠A + 105° = 180°

=> ∠A  = 180° - 105°

=> ∠A  = 75°

Answer 2

ANSWER:-

Total angle of a triangle = 180°

∆ B = 75°

∆C = 30°

Therefore,

=> ∆B + ∆C + ∆A = 180°

=> 75° + 30 °+ ∆A = 180°

=> 105° + ∆A = 180°

=> ∆A = 180° - 105°

$\boxed{=> ∆A = 75°}$

Hence, shown.