

negudar 7aces e quilatial twiangutar tdraladioy Figue is wlich because it has are Friangulae face 4 2 Carbon s Jn case CHy molecule tetaabedioy Ausent and Hhe centse at ny cleogen exi'st at 4- COLnes 7aces t cube altermate Reqular tetrabesal &hape H-atom 7caubon aton Cu lbe centr
angle between ngutar tedahidhon 2 vertices Calculath'on Cooレ) point CI,I 1) Pick above DAaw vectoz L,0) to tham ,o) 0,0D hom cetre points Lo,id aud CI,1,o) Co,0,0) CI,0,0) Centre = Lo.SoS O tind angle aud v2 betweey Noto =(0,121)- C.S.S = 0r,0.5 0.5) C1,1,0) - Cos,050.s): Co.5,0.57-0.5) dot thocluct Vse .V Cos 110,11 11Val -0-S.0.5+o.S.0.5+-0.S-0.S Ces 3x 0.5 3x0.S 3. 09. 47 = 109.5 So tetzahudral ongh 109