What’s an angle with its vertex at the center of the circle

Central Angle - An angle whose vertex is the center of a circle. Chord - A segment whose endpoints are on a circle.

Step-by-step explanation:

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6, 10

9, -13

12, -21

18, -23

step-by-step explanation:

you just add 6 to the x-coordinate and subtract 10 from the y-coordinate.

it is contrapositive

i could not see the question too well so check yourself again too . this is because i want you to get it correct.