Im pretty sure is 53.6656 but rounded to 53.7. To get that answers you would have to do a squared plus b squared=c squared you would leave a squared since there’s no number to plug in and do 22 as b squared and c as 58 squared then you would subtract 22 squared from 58 squared to equal 2880 then you would do the square root of that which is your answers 53.7