(i) A cuboid has 12 edges, namely AD, DC, CB, BA, EA, FB, HD, DC, CG, GH, HE, and GF.
![](/img/study_content/content_ck_images/images/2%2Cans(i)(2).png)
(ii) A tetrahedron has 6 edges, namely KL, LM, MN, NL , KM and KN.
![](/img/study_content/content_ck_images/images/RADHA(3).png)
(iii) A triangular prism has 9 edges, namely QR, RS, SQ, TU, UV, VT, RU, SV and QT.
![](/img/study_content/content_ck_images/images/KRISHNA(3).png)
(iv) A square pyramid has 8 edges, namely OW, OX, OY , OZ , WX, XY, YZ and ZW.
![](/img/study_content/content_ck_images/images/2%2Cans(iv)(2).png)