Answer :
Use the pythagorean theorem A²+B²=C²
Use 21ft for A
Use 14ft for B
Then solve for C (the diagonal)
21²+14²=C²
441+196=C²
673=C²
√673 = √C²
C≈25.24 or if you leave in radical form it is the square root of 637
Use 21ft for A
Use 14ft for B
Then solve for C (the diagonal)
21²+14²=C²
441+196=C²
673=C²
√673 = √C²
C≈25.24 or if you leave in radical form it is the square root of 637