Answer: 38°
Explanation:
∠1 and m∠62° are congruent as this is an isosceles triangle.
∠1 = 62°
∠2 + ∠1 + m∠62° = 180° because they form a triangle
∠2 + 62 + 62 = 180
∠2 + 124 = 180
Subtract both sides by 124
∠2 = 56°
∠2 and ∠3 are linear pairs so they're supplementary.
∠3 + ∠2 = 180°
∠3 + 56 = 180
Subtract both sides by 54
∠3 = 124°
∠4 + m∠18° + ∠3 = 180° because they form a triangle
∠4 + 18 + 124 = 180
∠4 + 142 = 180
Subtract both sides by 142
∠4 = 38°
Hope this helped!