Respuesta :

Answer:

X=29

Step-by-step explanation:

Answer:

29

Step-by-step explanation:

Since it's a right triangle, use Pythagorean theorem to help you

a² + b² = c²

You already have a and b so just plug them in

20² + 21² = c²

400 + 441 = c²

841 = c²

Root both sides

c = 29

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