Question

1.OBLICZ POLE POWIERZCHNI PROSTOPADŁOŚCIANU O KRAWĘDZIACH:
a) a=3cm,b=2cm,c=7cm
b)a=4cm,b=4cm,c=3cm
c)a=5cm,b=3cm,c=6cm
d)a=2całe i 1/2w ułamku cm,b=4cm,c=6cm

Answer 1

a)P=2ab+2bh+2ah
a=3 cm b= 2 cm c=7 cm
P=2*3*2+2*2*7+2*3*7
P=12+28+42
P=82
b)P=2ab+2bh+2ah
a=4 cm b=4 cm c=3 cm
P=2*4*4+2*4*3+2*4*3
P=32+24+24
P=80
c)P=2ab+2bh+2ah
a=5 cm b= 3 cm c=6 cm
P=2*5*3+2*3*6+2*5*6
P=30+36+60
P=126
d)P=2ab+2bh+2ah
a=2 ½ cm b= 4 cm c=6 cm
P=2*2,5*4+2*4*6+2*2,5*6
P=20+48+30
P=98

Answer 2

a) 2*(3*2) + 2*(3*7) + 2*(2*7)= 2*6+2*21+2*14=12+42+28=82 cm2

b) 2*(4*4)+4*(4*3)= 2*16+4*12= 32+48=80 cm2

c)2*(5*3)+2*(6*5)+2*(6*3)= 2*15+2*30+2*18=30+60+36=126 cm2

d)2*( 2 1/2 *4)+ 2*(6*2 1/2)+ 2*(6*4) = 2* 10 + 2*15+ 2* 24= 20+ 30+ 48= 98 cm2