Step-by-step explanation:
(a)
[tex] In\: \triangle ABC \& \triangle DEF \\\\
\frac {AB} {DE} = \frac {40} {48} = \frac {5} {6}...(1)\\\\
\angle ABC \cong \angle DEF... (each\: 90°)...(2)\\\\
\frac {BC} {EF} = \frac {30} {36} = \frac {5} {6}...(3)\\\\[/tex]
From equations (1), (2) & (3)
[tex] \triangle ABC \sim \triangle DEF[/tex]
(By SAS Postulate)
Hence both of the triangles are similar.
(b)
Prism DEF will have greater volume, because length of its sides are larger than that of prism ABC.
6/5 = 1.2 times greater.
