Respuesta :

35^2 - 21^2 = b^2 (Pythagorean’s)



b = 28 (review Pythagorean’s theorem and 30-60-90 triangle and the 45-45-90 triangle for the future)

Hope it helps !
719830

Answer:

b=28

Step-by-step explanation:

21²+b²=35²

441+b²=1225

b²=784

b=28

if you have any questions abt how to solve let me know

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