A. What is the sum of the internal angles of a triangle
B. Given the above sketch, compute the value of y.

Answer:
A 180 degrees
B y=15
Step-by-step explanation:
The angles of a triangle add to 180
6y-7 + 2y+3 + 4y+4 = 180
Combine like terms
6y+2y+4y -7+3+4 =180
12y=180
Divide by 12
12y/12 =180/12
y = 15
The sum of the internal angles in a triangle sum up to 180°.
So,
∠A + ∠B + ∠C = 180°
(4y + 4)° + (6y - 7)° + (2y + 3)° = 180°
4y + 6y + 2y + 4 - 7 + 3 = 180
12y + 0 = 180
12y = 180
y = 180/12
y = 15
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