" Life is not a problem to be solved but a reality to be experienced! "
© Copyright 2013 - 2024 KUDO.TIPS - All rights reserved.
promień koła = 4cm÷2 = 2cm
Pk = πr²
Pk = π×2cm² = 4πcm²
a=4cm
promień koła = ½×a√2 = ½×4√2 = 2√2
Pk= πr²
Pk = π×2√2² = π×4×2 = 8πcm²