Question
What should be added to $\left(\frac{2}{3}+\frac{3}{5}\right)$ to get $\frac{-2}{15}$ ?
✓
Answer
$\frac{-7}{5}$
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→(i) Which edge is the intersection of faces EFGH and EFBA?
(ii) Which faces intersected at edge FB?
(iii) Which three faces form the vertex $A$?
(iv) Which vertex is formed by the faces $A B C D, A D H E$ and CDHG?
(v) Give all the edges that are parallel to edge AB.
(vi) Give the edges that are neither parallel nor perpendicular to edge $B C$.
(vii) Give all the edges that are perpendicular to edge $A B$.