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 incorrect
because she treated
the figure as a single
rectangular pyramid
instead of a composite
shape
helens net is correct
because she
reorganized the solid
as a triangular prism.

Explanation:

A composite figure's net should account for all outer - facing surfaces. When two solids (here, a rectangular prism and a pyramid) are joined, the shared face (where they are connected) is not part of the surface area (as it is internal). Helen's net is incorrect because she forgot to exclude the shared rectangular face.

Answer:

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