Question

Triangle ABC is an isosceles triangle with AB = AC and CB is produced to D such that angle ABD =110 degree, angle A =
Please tell fast

Answer 1

angle ABD =110

AC = AB

in triangle ABC

AC= AB

so that angles also equal

I. e angle ACB = angle ABC

according to the question

ABD + ABC =180

110 + ABC = 180

ABC = 70

so, angle ACB = 70 ( isosceles triangle)

for triangle ABC

angle (A + B + C ) = 180

70 +70+ A = 180

140 + A = 180

A = 40

Answer 2

Answer:

I think 45 degrees

Step-by-step explanation:

take a triangle with 2 side equal length means AB = AC.

now given that angel ABD = 110 degree .

so , angle B = 70 degrees .

then angle D=45 degrees.

there fore angle A=45 degrees.