For this case we have that by definition, the Pythagorean theorem states that:
[tex]c = \sqrt {a ^ 2 + b ^ 2}[/tex]
Where:
a, b: Are the legs
c: It is the hypotenuse
According to the figure we have to:
[tex]a = 20\\b = 21[/tex]
Substituting in the formula we have:
[tex]c = \sqrt {(20) ^ 2 + (21) ^ 2}\\c = \sqrt {400 + 441}\\c = \sqrt {841}\\c = 29[/tex]
Answer:
Option D
