A isnt correct because radius goes from center of circle to any point on circle. Chord on the other hand connects 2 points on circle...
B is also false. Secant goes through circle while tangent only touches it in one point.
C is correct. Chord connects as said before 2 points on circle and in some cases it can connect 2 points in such way that it goes through center which is diameter.
D is not correct because chord doesnt have to pass trought center of circle in order to connect any 2 points on circle.
Harrison is correct because the 305 in the actual problem is greater than the 300 in the estimate and 57872 is less than 60000. Harrison arrived at his prediction by rounding to the nearest ten thousand and nearest hundred.
