Answer:
a = 50
Explanation:
In an isosceles triangle, two angles are equal. In this triangle, the base angles are equal.
65 + 65 + a = 180
Angles in a triangle add up to 180 degrees.
130 + a = 180
a = 180 - 130
m∠a = 50°
Since this is an isosceles triangle, we know that the other unknown angle is also 65°. Since all angles in a triangle add up to 180°,
180 - 65(2) = a
a = 50°
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