Question

pre-algebra ic sem 2 fall 2025
surface area of composite
figures
which statement best describes her work?
helens net is correct
because she included
the front, back, left,
right, and bottom faces
of the solid.
helens net is incorrect
because she forgot to
include the shared
rectangular face where
the upper and lower
solids are joined
together.
helens net is correct
because she
reorganized the solid
as a triangular prism.
helens net is incorrect
because she treated
the figure as a single
rectangular pyramid
instead of a composite
shape.

Explanation:

A composite figure's net should account for all faces, including those where components are joined. Helen's net is incorrect because she forgot to include the shared rectangular face where the upper and lower solids are joined. This face is internal in the composite figure and thus not part of the surface area, but in constructing the net (which represents the surface), omitting it is an error.

Answer:

Helen’s net is incorrect because she forgot to include the shared rectangular face where the upper and lower solids are joined.