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O B D Ĺ Ž N I K

D. C. ŠTVOREC. A. B. O B D Ĺ Ž N I K. ŠTVOREC. OBDĹŽNIK. a. a. C. D. C. D. a. a. b. b. B. A. B. A. a. a. OBVOD. o = 2 a + 2 b o = 2( a + b ). o = 4 a. AB=CD= a. AB=BC=CD=DA= a. BC=DA= b. SUSEDNÉ strany. PROTIĽAHLÉ strany. ŠTVOREC. OBDĹŽNIK.

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O B D Ĺ Ž N I K

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  1. D C ŠTVOREC A B O B D Ĺ Ž N I K

  2. ŠTVOREC OBDĹŽNIK a a C D C D a a b b B A B A a a OBVOD o = 2a+ 2bo= 2(a + b) o = 4a AB=CD= a AB=BC=CD=DA= a BC=DA= b

  3. SUSEDNÉ strany PROTIĽAHLÉ strany ŠTVOREC OBDĹŽNIK C D C D B A B A

  4.        ŠTVOREC OBDĹŽNIK C D C D B A B A Susedné strany sú na seba kolmé. AB  BC BC  CD CD  DA DA  AB

  5. ŠTVOREC OBDĹŽNIK C D C D B A B A Protiľahlé strany sú navzájom rovnobežné. AB  CD BC  DA

  6.  OSI SÚMERNOSTI  ŠTVOREC OBDĹŽNIK D C B A C D D C 4 2 B B A A

  7. KONŠTRUKCIA ŠTVORCA AB = a = 6cm D C A B

  8. KONŠTRUKCIA OBDĹŽNIKA AB = a = 10cm BC = b = 6cm D C A B

  9. ŠTVOREC OBDĹŽNIK a.a a.b b a a OBSAH S = a.b S = a.a

  10. Vypočítajte plochu chodby 11m 3m S2 S 8m = a.a S1 5m S1 = 5.5 5m S1 = 25 m2 = a.b S2 = 11.3 = S1+S2 S2 = 33 m2 S = 25 + 33 S = 58 m2 Plocha chodby je 58 m2.

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