Question

in triangle ABC, AB = AC if angle DAB = 70° and DA || BC find angle BAC​

Answer 1

Answer:

40 degree

Step-by-step explanation:

in this angle DAB = angle ABC = 70 degree (alternate interior angles are equal)

angle ABC = angle ACB = 70 degree (since AB = AC, angle opposite to equal sides are also equal)

therefore in triangle ABC,

  angle ABC=70 Degree

  angle ACB=70 Degree

so angle BAC= 40 degree (sum of all angles in a triangle is 180 degree, therefore angle BAC=(180-(70+70))=(180-140)=40 degree.