Dobrý deň. Potrebovala by som pomôcť s týmto príkladom:
Daný je pravidelný štvorboký ihlan ABCDV, ktorého bočná hrana má dĺžku 2 cm. Bod K je stred hrany CV a bod S je stred podstavy.
a)Ukázte, že v trojuholníku SCK platí |SK|=|SC|
b)Zobrazte rez ihlana rovinou DBK
c) Vypočítajte obraz mnohouholníka, ktorý vznikol rezom ihlana rovinou DBK, ak rovina DBK zviera s rovinou podstavy uhol 60°.
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