Question

I need help I don't understand this.

Answer 1

9514 1404 393

Answer:

∠4 = 108°

Explanation:

Angles 2 and 4 together form a "linear pair". That is, the sum of them is 180°, a "straight angle." They are supplementary.

∠4 = 180° -∠2 = 180° -72°

∠4 = 108°