Question

DETERMINATI RAZA DISCULUI CARE ARE ARIA EGALA CU: a)16πcm²; b)36πcm²; c)225πcm²; d)2πcm² (multumesc)

Answer 1

$A=\pi r^2\\a) A=16\pi cm^2\\16\pi=\pi r^2=>r=\sqrt{16}=4 cm\\b)A=36\pi cm^2\\36\pi=\pi r^2=>\sqrt{36}=6 cm\\c) A=225\pi cm\\225\pi=\pi r^2=>r=\sqrt{225}=15 cm\\d)A=2\pi cm^2\\2\pi=\pi r^2=>r=\sqrt{2} cm$