It is probably a quiz question with nothing to do with mathematics.
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If ... the square of (the x-coordinate of the point minus the x-coordinate of the center of the circle) added to the square of (the y-coordinate of the point minus the y-coordinate of the center of the circle) is equal to the square of the circle's radius, then the point is on the circle.
Plus or minus the base. If the base is X and you square it, you get X2. If you take the square root of that, you get Plus or Minus X. This is because X*X equals X2 and -X*-X also equals X2.
A equals Vf minus Vi divided by time equals triangle v divided by time
No. But sin2a equals 1 minus cos2a ... and ... cos2a equals 1 minus sin2a
square root of 8