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please help asap what is m A

Please Help Asap What Is M A class=

Sagot :

9514 1404 393

Answer:

  ∠A = 66°

Step-by-step explanation:

The other base angle (∠B) of this isosceles triangle is also 57°. Of course, the total of all angles is 180°, so we have ...

  ∠A +∠B +∠C = 180°

  ∠A + 57° + 57° = 180° . . . fill in the known numbers

  ∠A = 66° . . . . . . . . . . . . . subtract 114° from both sides