We have,AB=AC
∠B=58∘
Since, ABC is an isosceles triangle.
So, ∠B=∠C=58∘
We know that
∠A+∠B+∠C=180∘
∠A+58∘+58∘=180∘
∠A=180∘−116∘
∠A=64∘
Hence, the value of ∠A is 64∘.