Respuesta :

salomerailoa

Answer:

20 units

Step-by-step explanation:

31 - 7 = 24

33 - 1 = 32

24 ^2 + 32^ 2 = c^2

576 + 1024 = c^2

c = 40(diametre)

r = 40÷ 2

= 20 units

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