Answer:
A.)63°
Explanation:
54°+63°+63°=180°
For this, you would use the Angle Sum Theorem which means the sum of the measures of a triangle's angles should always end up equaling 180°
A P E X Hope this helps Happy Holidays
A.
The sum of interior angles in a triangle is 180°
2y + 54 = 180
2y = 126
y = 63
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