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tonb
Let's call the third corner of the triangle z. Then z = 180°-115° = 65°.

The triangle is 'mirror' symmetrical, so x must be 65° as well. That leaves 180°-(2*65) = 50° for y.
kenide992
let take any point for the other corner
lets take b
because all of the angle are equal to 180 so we says that

b =180_115
what give us 65

the way that the triangle is made we can say is symetric
so its equal

65×2=130

180-130=50

the answer is 50

hopes it help