Answer:
here, suppose the missing length be X
hy ^2 = (one side square )^2 +(Other side square)^2
29^2= X^2 + 21^2
841 = X^2 + 441
X^2 = 841 - 441
X^2 = 400
X = 20 .........taking square root both side
the value is missing side length is 20 .
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