Question

4.Aflati raza discului care are aria egala cu:
a)36 || cm^2;
b)81 || cm^2;
c)45 || cm^2.

( ||=Pi......^2=la puterea 2)

Answer 1

   
a)   Aria = 36π cm² = πR² ⇒  R = √36 = 6 cm
b)   Aria = 81π cm² = πR² ⇒  R = √81 = 9 cm
c)   Aria = 45π cm² = πR² ⇒  R = √45 = √(9 × 5) = 3√5 cm