oblicz powierzchnie całkowita stozka i objętość o podanych wymiarach;
a)l=10, h=8
b)l=8.h=5
c)l=4,h=1
prosze o pomoc ;)
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a)
l² = r² + h²
10² = r² + 8²
r² = 100 - 64
r² = 36
r = √36
r = 6
V = π6² * 8
V = 36 * 8 π
V = 288 π j³
π6² = 36π
obw = 2πr
Obw = 12π
12π* 10
120π
P = 36π + 120π
P = 156 π j²
b)
r² = l² - h²
r² = 64 - 25
r² = 39
r = √39
V = √39²π * 5
V = 39π * 5
V = 195 π j³
Pole
πr²
39π
2πr
2√39π * 8
16√39π
P = 39π + 16√39π j³
c)
r² = l² - h²
r² = 16 -1
r² =15
r = √15
V =√15² π * 1
V = 15 π j³
Pole
πr²
15π
2πr
2√15π
2√15π * 4
8√15π
P = 15π +8√15π