The matrix C=[1,-2_-3,7] was used to encode a phrase to [7,-28,-25,-35,-2_-21,107,90,123,17]. Find C^-1 and use it to decode the
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Answer:
ab = 24
so ac is half, so
ac = 12
and the radius is 13,
draw a line from a to o
and its tall will be 13 because it is the radius and o is the center
now use Pythagoras rule
put numbers
and solve for b
b = 5
and that is the side we want