Question

Oblicz pola powierzchni graniastosłupów.

Answer 1

P = 2Pp + Pb

 

a)

P = 2·5·5 + 4·5·6 = 50+120

P = 170 [j²] 

 

b)

P = 2 · 2²√3/4 + 3·2·4 = 2√3 + 24

P = 2(√3+12)  [j²]

 

c)

a = 4

b = 3

c = ?

P = ?

 

Z tw. Pitagorasa:

c² = a²+b²

c² = 4²+3² = 16+9 = 25

c = 5

 

P = 2 · ½ ·4·3 + 7(3+4+5) = 12+84

P = 96 [j²]

 

d)

P = 2·2·4 + 2·2·5 + 2·4·5 = 16+20+40  

P = 72 [j²]