Question

Aria unui disc 4.84 pi cm pătrați. Aflați diametrul discului. ​

Answer 1

A = aria
r = raza
d = diametrul
A = pi × r^2
A = 4.84 pi
pi × r^2 = 4.48 pi
r^2 = 4.48
r = 2.11 cm
d = 2r
d = 2 × 2.11
d = 4.22 cm

Answer 2

$A_{disc}=4,84\pi cm^2\\A_{disc}=\pi r^2\\=> \pi r^2=4,84\pi /:\pi => r^2=4,84 => r=\sqrt{4,84} => r = 2,2 cm\\d=2r => d=2\times2,2=>d=4,4cm$