The adjacent sides of a parallelogram are 30 and 20. The length of one of the diagonal is 40. What is the length of the other diagonal?
so we square the diagonal to get 1600 then we subtract 2(30^2-20^2) to get 600 then add 20^2 to get 1000 then we square root it to get √1000
Edited reason: wrong spelling :(
