484,220 views
37 votes
37 votes
What is the value of y?

What is the value of y?-example-1
User Stovfl
by
2.9k points

1 Answer

15 votes
15 votes

Answer:

y = 15

Explanation:

since AB and AC are congruent then Δ ABC is isosceles with base angles congruent, that is

∠ C = ∠ B = 25°

the sum of the 3 angles in a triangle = 180°

sum the 3 angles and equate to 180

∠ A + ∠ B + ∠ C = 180 , so

7y + 25 + 25 + 25 = 180

7y + 75 = 180 ( subtract 75 from both sides )

7y = 105 ( divide both sides by 7 )

y = 15

User Sangcheol Choi
by
3.2k points