IXL | Identify parallel, intersecting, and skew lines and planes | 7th grade math

or

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

C

D

E

F

G

H

CD

and

GH

DE

and

EH

CD

and

EH

DE

and

FG

ref_doc_title.

or

Learn with an example

question

In the cube shown below, which lines are parallel?

S

R

Q

P

O

N

M

L

NR

and

LM

PQ

and

QR

PS

and

MQ

LP

and

MQ

key idea

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

solution

Find
NR
and
LM
.

S

R

Q

P

O

N

M

L

NR
and
LM
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
PQ
and
QR
.

S

R

Q

P

O

N

M

L

PQ
and
QR
are
intersecting
lines
because
they
meet
at
point
Q.
They
are
not
parallel
lines,
because
parallel
lines
must
never
intersect.

Find
PS
and
MQ
.

S

R

Q

P

O

N

M

L

PS
and
MQ
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
LP
and
MQ
.

S

R

Q

P

O

N

M

L

LP
and
MQ
are
parallel
lines
because
they
are
in
the
same
plane
( LMP )
and
never
intersect.

So,
the
parallel
lines
are
LP
and
MQ
.

Looking for more? Try these:

Lesson: Parallel and perpendicular lines

or

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Teacher tools

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Not feeling ready yet? These can help:

Y.3Parallel, perpendicular, and intersecting lines

Lesson: Parallel and perpendicular lines