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3 years ago

What is the value of y? Enter your answer in the box.

Mathematics

1 answer:

Scrat [10]3 years ago

8 0

Answer:

y = 20

Step-by-step explanation:

Since AB and AC are congruent then the triangle is isosceles, thus

∠B = ∠C = 25°

To find ∠A subtract the sum of the 2 angles from 180°

∠A = 180° - (25 + 25)° = 180° - 50° = 130°, thus

3y + 70 = 130 ( subtract 70 from both sides )

3y = 60 ( divide both sides by 3 )

y = 20

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