If Triangle M N O is congruent to triangle N M O, what statement best describes triangle MON? The triangle is scalene.
The triangle is equilateral.
The triangle is isosceles and possibly equilateral.
The triangle is isosceles but definitely not equilateral.

hi the answer is c

Step-by-step explanation:

this is verrified (by my know it all brother)

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The answer is c

Step-by-step explanation:

the sum of all the angles in a triangle are equal to 180

so you can add   the 3 given angles together to equal 180:

5y + 2y + 2y = 180

or since all three angles have the same letter, combine the 3 angles to equal 180:

9y = 180