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I found this by conservation of energy, the answer was .0528 m

Find the angle (in degrees) through which the block rises, if the strings are 0.280 m in length.

I tried doing this using trig.

the hypotenuse= .280 m

opposite = (.280-.0528) = .2272 m

adjacent= x

sin^-1 (.2272/.280)= 54.2 deg.

What am I doing wrong?