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Apply Pythagorean theorem in $∆AED$ & $∆BFC $ & $∆FHC$ . Try to find out the height of $∆BFC$
In rectangle $ABCD$, $∆AED$ & $∆BFC$ two right angle triangle are drawn such that $F$ lies on $DE $ . If $AE=21,ED=72,BF=45$ then $AB=?$
Apply Pythagorean theorem in $∆AED$ & $∆BFC $ & $∆FHC$ . Try to find out the height of $∆BFC$