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To find the value of c in a right triangle, you can use the Pythagorean theorem which states:
a^2 + b^2 = c^2
Given that the sides a and b are 20 and 21, respectively, you can substitute the values into the equation and solve for c:
20^2 + 21^2 = c^2
400 + 441 = c^2
841 = c^2
c = √841
c = 29
Therefore, the value of c in the right triangle is 29.
The correct response is:
29