IXL | Parts of three-dimensional figures | 8th grade math

or

Look at this figure:

What is the shape of its bases?

rectangle

square

triangle

nonagon

ref_doc_title.

or

Learn with an example

question

In the triangular prism shown below, which lines are parallel?

W

V

U

T

S

R

RT

and

UW

ST

and

UW

RS

and

VW

RT

and

SV

key idea

Parallel lines are lines that are in the same plane and never intersect.

solution

Find
RT
and
UW
.

W

V

U

T

S

R

RT
and
UW
are
parallel
lines
because
they
are
in
the
same
plane
( RTU )
and
never
intersect.

Find
ST
and
UW
.

W

V

U

T

S

R

ST
and
UW
are
skew
lines
because
they
are
not
in
the
same
plane.
They
are
not
parallel
lines,
because
parallel
lines
must
be
in
the
same
plane.

Find
RS
and
VW
.

W

V

U

T

S

R

RS
and
VW
are
skew
lines
because
they
are
not
in
the
same
plane.
They
are
not
parallel
lines,
because
parallel
lines
must
be
in
the
same
plane.

Find
RT
and
SV
.

W

V

U

T

S

R

RT
and
SV
are
skew
lines
because
they
are
not
in
the
same
plane.
They
are
not
parallel
lines,
because
parallel
lines
must
be
in
the
same
plane.

So,
the
parallel
lines
are
RT
and
UW
.

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Teacher tools

Work it out

Not feeling ready yet? These can help:

AA.1Bases of three-dimensional figures

Y.3Parallel, perpendicular, and intersecting lines

DD.1Lines, line segments, and rays