The measure of the unknown angle in the triangle is 58 degrees.
What is a triangle ?
A triangle has three sides and the sum of the angles of a triangle is 180 degrees.
Triangles can be classified base on there angles and length of the sides.
Therefore,
let the length of the unknown angle = x
x + 65° + 57° = 180°
x + 122 = 180
subtract 122 from both sides
x + 122 - 122 = 180 - 122
x = 58 degrees
leanr more on triangle here: https://brainly.com/question/8691602
