" Life is not a problem to be solved but a reality to be experienced! "
© Copyright 2013 - 2024 KUDO.TIPS - All rights reserved.
b=2a+2dm
obwód =2a+2b
2a+2(2a+2)=13dm
2a+4a+4=13dm
6a=13-4
6a=9
a=9:6
a=1,5dm
b=2a+2dm=2×1,5dm+2dm=3+2=5dm
spr. 2a+2b=3+10=13dm
skala 2:1 oznacza, że masz boki powiekszyć 2 razy, czyli
x=2×1,5dm=3dm
y=2×5dm=10dm
pole=xy=3×10=30dm²