Answer: 29 inches.
Explanation:
The formula to find the hypotenuse is a^2 + b^2 = c^2.
20^2= 400, and 21^2=441. Together, it was 841. Square root that, and your answer is 29.
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a^2 + b^2 = c^2
20^2 + 21^2 = c^2
400 + 441= c^2
881 = c^2
29=29
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