Obwód prostokąta wynosi 18,6 cm, a jeden z jego boków 4 całe i jedna druga . Oblicz pole prostokąta
O=18,6cm
1 bok a=4,5cm
2 bok=b
O=2a+2b
18,6=2·4,5+2b
18,6=9+2b
18,6-9=2b
9,6=2b /:2
b=4,8cm
pole prostokata
P=ab=4,5cm·4,8cm=21,6cm²
4 1/2 = 4,5
4,5*2= 9 cm
18,6-9= 9,6cm
9,6:2 = 4,8cm
Dane:
a=4,5cm
b=4,8 cm
p= a*b
p=4,5*4,8
p=21,6 cm 2
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O=18,6cm
1 bok a=4,5cm
2 bok=b
O=2a+2b
18,6=2·4,5+2b
18,6=9+2b
18,6-9=2b
9,6=2b /:2
b=4,8cm
pole prostokata
P=ab=4,5cm·4,8cm=21,6cm²
4 1/2 = 4,5
4,5*2= 9 cm
18,6-9= 9,6cm
9,6:2 = 4,8cm
Dane:
a=4,5cm
b=4,8 cm
p= a*b
p=4,5*4,8
p=21,6 cm 2
licze na naj ;)