Download Geometry of Straight Lines - E

GRADE 7
Grade 7 Mathematics Term 1:Space and Shape - Geometry of straight lines
Geometry of Straight Lines
Name:
book
© e-classroom 2013 www.e-classroom.co.za
GRADE 7
Grade 7 Mathematics Term 1:Space and Shape - Geometry of straight lines
Geometry of Straight Lines (2)
© e-classroom 2013 www.e-classroom.co.za
Name:
Answer these questions in your class workbook.
book.
1.
Provide the definitions for each of these words and draw an example for
each of them.
a)
line segment
- a line that has a definite end (or point) and beginning
b)
ray
- a line with a definite starting point but no clear or
definite end
c)
straight line
- a line with no definite beginning or end
d)
parallel lines
- two lines that run next to each other that are equal
distances from each other and will never touch
e)
2.
perpendicular lines - two lines that make a right angle with each other.
For each of the segments below, say whether the segment is a line segment, ray,
straight line, parallel lines or perpendicular lines.
a)
line segment
b)
straight line
c)
ray
d)
ray
e)
parallel lines
f)
straight line
g)
line segment
h)
perpendicular lines
i)
ray
j)
parallel lines
© e-classroom 2013 www.e-classroom.co.za
GRADE 7
Grade 7 Mathematics Term 1:Space and Shape - Geometry of straight lines
Geometry of Straight Lines: Answer Sheet
What is the symbol for
a)
4.
parallel lines?
-∥
b)
perpendicular lines
-⊥
Draw the following as accurately as possible – remember to use your ruler:
Note to teacher: answers may not be drawn to scale, but the end points are what is
important in this exercise
a)
draw a ray that is 5cm long
b) draw parallel lines that are 2cm apart
5cm
c)
draw a line segment 10cm long
2cm
d) draw a straight line that is 40mm long
10cm
e)
draw a set of perpendicular lines
4cm
f)
draw a ray that is 35mm long
3.5cm
© e-classroom 2013 www.e-classroom.co.za
Grade 7 Mathematics Term 1:Space and Shape - Geometry of straight lines
3.
GRADE 7
Geometry of Straight Lines: Answer Sheet (2)
g)
draw a straight line that 55mm long
h) draw parallel lines that are 1cm apart.
5.5cm
i)
1cm apart
draw a line segment that is 47m long
j)
draw a set of perpendicular lines
4.7cm
5.
Give 3 examples of where you would find these lines in real life:
Note: As long as the examples are logical and make sense they can be allowed. The
answers below are just some suggestions
a)
line segment
- a ruler, the length of a desk; the height of someone; how
far you walk to school; and so on – as long as there is a
beginning and an end
b)
ray
- a road; the start of a ball of string; toilet paper; any line
that has a definite beginning but no definite end (or end in
sight)
© e-classroom 2013 www.e-classroom.co.za
GRADE 7
Grade 7 Mathematics Term 1:Space and Shape - Geometry of straight lines
Geometry of Straight Lines: Answer Sheet (3)
straight
line
c)
line
c)c) straight
straight
line
c)
straight
line
-tiles
tiles
amall/
mall/
shopping
centre;
newspaper
atthe
the
---tiles
inin
shopping
centre;
newspaper
atat
inainaamall/
mall/
shopping
centre;
newspaper
atthe
the
tiles
shopping
centre;
newspaper
printers;
the
middle
aball
ball
ofwool/
wool/
string;
any
line
that
printers;
the
middle
ofof
ofof
string;
any
line
that
printers;
the
middle
ofaofaaball
ball
ofwool/
wool/
string;
any
line
that
printers;
the
middle
string;
any
line
that
doesn’t
have
adefinite
definite
beginning
orend.
end.
doesn’t
have
aaadefinite
beginning
oror
doesn’t
have
definite
beginning
orend.
end.
doesn’t
have
beginning
parallel
lines
d)
lines
d)d) parallel
parallel
lines
d)
parallel
lines
-the
the
edges
ofthe
the
road;
the
edges
adesk;
desk;
table
legs;
---the
edges
ofof
road;
the
edges
ofof
table
legs;
edges
ofthe
the
road;
the
edges
ofaofaadesk;
desk;
table
legs;
the
edges
road;
the
edges
table
legs;
pencils
next
toeach
each
other;
any
two
lines
that
not
touch
pencils
next
toto
other;
any
two
lines
that
do
not
touch
pencils
next
toeach
each
other;
any
two
lines
that
dodo
not
touch
pencils
next
other;
any
two
lines
that
do
not
touch
and
always
equal
distances
from
each
other
and
always
equal
distances
from
each
other
and
always
equal
distances
from
each
other
and
always
equal
distances
from
each
other
perpendicular
lines
aT-junction;
T-junction;
the
letter
Tor
orL;
L;the
the
leg
atable
table
e)
lines
---aa-aT-junction;
the
letter
TTTor
leg
ofof
e)e) perpendicular
perpendicular
lines
T-junction;
the
letter
orL;
L;the
the
leg
ofaofaatable
table
e)
perpendicular
lines
the
letter
leg
joined
atable;
table;
the
corner
aroom.
room.
Any
two
lines
that
joined
toto
the
corner
ofof
Any
two
lines
that
joined
toatoaatable;
table;
the
corner
ofaofaaroom.
room.
Any
two
lines
that
joined
the
corner
Any
two
lines
that
are
atright
right
angles
toeach
each
other
are
atat
angles
toto
other
are
atright
right
angles
toeach
each
other
are
angles
other
© e-classroom 2013 www.e-classroom.co.za
GRADE 7
Grade 7 Mathematics Term 1:Space and Shape - Geometry of straight lines
Geometry of Straight Lines: Answer Sheet (4)