
Kocka i Kvadar
Presentation
•
Mathematics
•
8th Grade
•
Hard
žarko markov
Used 1+ times
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10 Slides • 11 Questions
1
Kocka i Kvadar
2
KOCKA
Označavanje i formule:
a - osnovna ivica
B - površina osnove(baze)
M - površina omotača
P - površina kocke
V - zapremina kocke
d - dijagonala osnove
D - dijagonala kocke
PD - površina dijagonalnog preseka
3
Primer 1:
Izračunaj površinu i zapreminu kocke čija je osnovna ivica 7cm.
P,V=?
P=6⋅a2=6⋅72=6⋅49=294cm2
V=a3=73=343cm3
4
Primer 2:
Površina kocke je
150cm2 . Izračunaj zapreminu kocke.
6⋅a2=150
a2=6150=25
a=25=5cm
V=53=125cm3
5
primer 3.
Izračunaj površinu i zapreminu kocke, ako je dijagonala kocke D=113cm
D=a3
a3=113
a=3113=11cm
P=6⋅112=726cm2
V=113=1331cm3
6
primer 4:
Zapremina kocke je 216cm3. Izračunaj površinu dijagonalnog preseka kocke.
V=a3
a3=216 a=6cm jer je 6⋅6⋅6=216
Pd= a22
Pd=622=362cm2
7
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Multiple Choice
Ivica kocke je a=4cm. Dijagonala te kocke je:
16cm
42cm
43cm
12cm
11
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12
KVADAR
Označavanje i formule:
a, b, c - ivice kvadra
B - površina osnove(baze)
M - površina omotača
P - površina kvadra
V - zapremina kvadra
d - dijagonala osnove
D - dijagonala kvadra
PD - površina dijagonalnog preseka
13
Primer 1:
Ivice kvadra su a=5cm, b=6cm i c=7cm. Izračunaj površinu i zapreminu tog kvadra.
P=2⋅5⋅6+2⋅5⋅7+2⋅6⋅7
P=60+70+84=214cm2
V=5⋅6⋅7=210cm3
14
Primer2:
Dve ivice kvadra su a=2cm i b=5cm. Izračunaj površinu tog kvadra, ako mu je zapremina 30cm3.
V=a⋅b⋅c ⟹ c=a⋅bV
c=2⋅530=3cm
P=2⋅2⋅5+2⋅2⋅3+2⋅5⋅3=62cm2
15
Primer 3:
Izračunaj dijagonalu kvadra čije su ivice 3cm, 4cm i 12cm.
D=a2+b2+c2
D=32+42+122=9+16+144
D=169=13cm
16
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Poll
Da li ti je ova lekcija bila razumljiva?
DA
NE
Kocka i Kvadar
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