Răspunsuri

2014-10-09T15:21:16+03:00
A= pi x 20 cm la a doua =pix 400 cm =400 pi patrati
p=2 pi x raza
=40 pi
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  • Utilizator Brainly
2014-10-09T15:24:41+03:00
A= πr²= 400π≈ 400*3,14=1256
L= 2πr= 40π≈ 125,6
2 4 2