Oblicz P i V stożka o promieniu 4 i wysokości 4
r = 4
H = 4
P = ?
V = ?
P = TTr^2 + TTrl
Z tw. Pitagorasa liczę długość tworzacej "l" :
H^2 + r^2 = l^2
l^2 = 4^2 + 4^2 = 16 + 16 = 32
l = V32 = 4V2
P = TT * 4^2 + TT * 4 * 4V2 = 16TT + 16V2TT = 16TT(1+V2)
przyjmując:
TT = 3,14
V2 = 1,41
P = 121,08 [j2]
=============
V = 1/3 *TTr^2 * H
V = 1/3 TT * 4^2 *4 = 64TT/3
V = 66,99 [j3]
===========
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r = 4
H = 4
P = ?
V = ?
P = TTr^2 + TTrl
Z tw. Pitagorasa liczę długość tworzacej "l" :
H^2 + r^2 = l^2
l^2 = 4^2 + 4^2 = 16 + 16 = 32
l = V32 = 4V2
P = TT * 4^2 + TT * 4 * 4V2 = 16TT + 16V2TT = 16TT(1+V2)
przyjmując:
TT = 3,14
V2 = 1,41
P = 121,08 [j2]
=============
V = 1/3 *TTr^2 * H
V = 1/3 TT * 4^2 *4 = 64TT/3
V = 66,99 [j3]
===========