Is 1.352 and 0.84 coeset to 0,1,2 or 3

If chord ab is congruent to chord cd, then what must be true about ef and eg?

Can someone me with #s 8, 9, and 11. with just one of the three also works. prove using only trig identities.

The point of intersection of the diagonals of a rectangle is 4 cm further away from the smaller side then from the larger side of the rectangle. the perimeter of the rectangle is equal to 56 cm. find the lengths of the sides of the rectangle. 16 points answer quick