" Life is not a problem to be solved but a reality to be experienced! "
© Copyright 2013 - 2024 KUDO.TIPS - All rights reserved.
½ obwodu=54;2=27cm
pole=√27(27-20)(27-21)(27-13)=√27×7×6×14=√15876=126
R=promień okregu opisanego=20×21×13:4×126=5460:504=10⅚
r= promień okregu wpisanego=2×126:54=4⅔cm