180 degrees
Vertical angles are opposite angles that share only a vertex. Since ∠3 is adjacent to both ∠1 and ∠2, this means that ∠3 shares a side and vertex with both of these angles.
This means that ∠3 and ∠1 form a straight line; this makes them a linear pair, which makes their sum 180°.
Answer:
C
Step-by-step explanation:
Decimals and percentages are both systems of designating parts of a whole. 25% of an object is the same as 1/4 of an object which is the same as .25 of an object.
