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Calculati aria discului cu raza de :
3 supra 4 cm , 2,(3) cm ,2 supra 3.14 cm

Răspuns :

Andreeamanarcaask
A disc = pi x R^2
A = (3/4)2 x pi
   =9/16 pi

2(3) =23/9

A = (23/9)^2 x pi
   = 529/81 x pi 

3,14 = 314/100 = 157/50

A= 2/157/50 x pi
  =2 x 157/50 x pi
  = 314/50 x pi

x- inmultire
pi -pi(numar irational 3,14<pi<3,15
/  -supra
^2 -la parat (puterea a 2

Miky93ask
A=πR²
A=(3/4)²π=  9/16π

2,(3)= 2 intregi 3/9= 2 intregi 1/3=  7/3
A=(7/3)²π=  49/9π

A=(2/3,14)²π= 4/9,8596 π=  0,405π

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