I don’t understand ?

vertical 7 and 4

supplementary 5 and 1

1. vertical angles: <2 and <5

2. Supplementary angles: <6 and <2

Step-by-step explanation:

Vertical angles are angles that are opposite to each other

-they will always have the same measure

-examples from the picture: 2 and 5, 6 and 1, 3 and 8, 7 and 4

Supplementary angles are angles that add up to 180

-they will always be able to form a straight line

-examples from the picture: 1 and 5, 6 and 2, 1 and 2, 5 and 6, 3 and 7, 7 and 8, 3 and 4, 8 and 4

the battle of gettysburg is considered the "high water mark" of the confederacy because it marked the greatest advance of the confederate forces against the union.

b

step-by-step explanation: