Question

8. Calculați aria discului cu diametrul de:
a) 8 cm; b) 15 cm; c) 10/ π
cm;
d) 4,(4) cm​

Answer 1

Răspuns:

a)64π cm^2 b)1,96π cm^2 c)100/π cm^2 d)19,36π cm^2

Explicație pas cu pas:

A=πR^2

a)A==π*8*8=64π cm^2

b)A=π *7/5*7/5=π *140/100*140/100=π *1,4*1,4=1,96π cm^2

c)A=π*10/π *10/π =π*100/π^2=100/π cm^2

d)A=π*4,(4)*4,(4)=19,36π cm^2