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Math Homework November
30th - December 7th, ZOLT
Skills You'll Need:
Quick Review
are the same distance from the centre of the circle.
the distance
between a point on a circle and the
centre of the circle is a radius of the circle. The
plural of radius is radii.
The distance between two points on a circle
through its centre is a diameter of the circle.
times the length of any radius, r.
Thatis,
d=2r
Another way of thiriking about this relationship is that the
radius, r, of acircle is
one-half the diameter, dTltatis, 7 =
id, ",
t
You cdh find the diameter of a circre for a given radius,
and vice versa.
For example, in a circle, d= 10.
Since r=lil,r=5,
If r = 5 is given, then use d= Zr.
d=2x5=10
l.
This circle has the centre at point O.
a) Draw a radius of the circle.
What is the radius of the circle?
2 or*.
b) Draw a diameter of the circle.
What is the diameter of the
,,rf.F
L
circle?
al
cr^
From your results in question l, write a relationship between
the radius and the diameter
of a
circle.
lr
=
d
3.
Find the diameter of the circle with each radius.
al r2.*
{
dt
2t ctn
bl 27
r,23- l.Ltbrwr
.)
::!
a.
,^ 5'l
cvn
** 0.bbt^Ls*
6-$
c) 3.4 cm
o
*.*
I
"'^
-1,lq
.4 .,-^.
11 cvv\
lo
Find the radius of the circle with each diameter.
al
12
cm
I
b Cnn
dl r.23m 0.615vr^
b)
27.* l3.Sc*
.)
**
L
O.lbS rn
c) 3.4 cm
l-?cn-
fl *.*
0.TSc,v-
z^
Write the steps you would take to
iru*.
circle with diameter 4 cm.
{. (At{ c.o\af f
L. **
3.
6.
r= 7.,n
aicolz
l@
@=pa"'-
"cte*k
Circular plates with diameter 12 cm are placed side by side on the top of a table.
The table measures 2.4mbY 1.2 m.
To convert metres
to centlmetres,
a) What is the length of the tabletop in centimetres?
multtply by
b) How many Blates can fit side by side along the length of the table?
cn^
c)
What is the width of the tabletop in centimetres? I 24
d)
How many plates can fit side by side along the width of the table?
e)
'!40.
How many plates can fit side by side on the tabletop with no part of a plate extending
over the edge of the table?
Zno f,t-.{.s
t