Question

OBLICZ POLA POWIERZCHNI PROSTOPADLOŚCIANÓW O WYMIARACH :

4 M X 7M X 2M

2CM X 4,5CM 3,5CM

11DM X 11DM X 11DM

25MM X 4,7CM X 0,2 DM

Answer 1

 4 M X 7M X 2M

2·4m·7m +2·7m·2m + 2·2m·4m = 56m²+28m²+16m² = 100m²

 

2CM X 4,5CM 3,5CM

2·2cm·4,5cm + 2·4,5cm·3,5cm +2·3,5cm·2cm = 18cm²+31,5cm²+14cm² = 63,5cm³

 

11DM X 11DM X 11DM

6·11dm·11dm = 726dm²

 

25MM X 4,7CM X 0,2 DM

25mm = 2,5cm

4,7cm

0,2dm = 2cm

2·2,5cm·4,7cm + 2·4,7cm·2cm + 2·2cm·2,5cm = 23,5cm²+18,8cm²+10cm² = 52,3cm²

Answer 2

Wzór na pole powierzchni: 2ab+2ac+2bc

 

a)

a=4m

b=7m

c=2m

Pc=2Pp+Pb

Pc=2*a*b+2*a*c+2*b*c

Pc=2*4m*7m+2*4m*2m+2*7m*2m

Pc=56m²+16m²+28m²

Pc=100m²

b)

a=2cm

b=4,5cm

c=3,5cm

Pc=2Pp+Pb

Pc=2*a*b+2*a*c+2*b*c

Pc=2*2cm*4,5cm+2*2cm*3,5cm+2*4,5cm*3,5cm

Pc=18cm²+14m²+31,5cm²

Pc=63,5cm²

c)

a=11dm

b=11dm

c=11dm

Pc=2Pp+Pb

Pc=2*a*b+4*a*c

Pc=2*11dm*11dm+4*11dm*11dm

Pc=242dm²+484dm²

Pc=726dm²

d)

a=25mm=2,5cm

b=4,7cm

c=0,2dm=2cm

Pc=2Pp+Pb

Pc=2*a*b+2*a*c+2*b*c

Pc=2*2,5cm*4,7cm+2*2,5cm*2cm+2*4,7cm*2cm

Pc=23,5cm²+10cm²+18,8cm²

Pc=52,3cm²

 

 

Mam nadzieję, że pomogłem :) Pozdrawiam