" Life is not a problem to be solved but a reality to be experienced! "
© Copyright 2013 - 2024 KUDO.TIPS - All rights reserved.
a = 5 cm
Pc = 90 cm²
V = ? [cm³]
V = a²h
Pc = 2a² + 4ah
2(5 cm)² + 4(5 cm)h = 90 cm²
50 cm² + (20 cm)h = 90 cm²
(20 cm)h = 90 cm² - 50 cm²
(20 cm)h = 40 cm² / :(20 cm)
h = 2 cm
V = (25 cm²)(2 cm)
V = 50 cm³
Odp: Objętość prostopadłościanu wynoci 50 cm³.
Pc=90cm²
Pp=a²
a=5cm
Pp=5²
Pp=25cm²
90cm²=2*25cm²+4*a*h
90cm²=50cm²+4*5cm*h
90cm²=50cm²+20cm*h
20cm*h=90cm²-50cm²
20cm*h=40cm²/:20cm
h=2cm
V=Pp*h
V=25cm²*2cm
V=50cm³
odp.objętość prostopadłościanu wynosi 50cm³
a=5
b=5
c=?
P=90
2(ab+bc+ac)
2(5*5+5*c+5*c)=90
2(25+10c)=90
50+20c=90
20c=90-50
20c=40/20
c=2
V=5*5*2
V=25*2=50cm sześciennych