Respuesta :

Jamayaa

Answer:

800

Step-by-step explanation:

d=2r=2·400=800

StarDolly07

Answer:

The diameter of the circle is 800 millimeters

Step-by-step explanation:

The diameter of a circle is twice as much as a radius.

400 x 2 = 800 millimeters

I Hope That This Helps! :)

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