It is to be noted that where in triangle ABC the measure of angle A is 58° and the line segment AB ≅ AC, then the measure of angle C is: 61°. (Option D). This is because the triangle is an isosceles triangle.
What is an Isosceles triangle and how does that help to solve this problem?
An isosceles triangle is a triangle with two equal-length sides in geometry. It is a well-known rule that the two angles opposite the equal sides are congruent.
Hence, if ∠BAC = 58°; and
∠ABC = ∠ACB
Then,
∠ACB = (180° - 58°)/2 because the Sum of angles in a triangle is 180°
Thus, ∠ACB
= 122/2
∠ACB = 61°
Thus, the measure of Angle C or ∠ACB = 61°
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