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What is Pi?
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Ratio of the circumference and the diameter
Ratio of the circumference and the diameter
5
Expression 6: "R" Subscript, "a" "t" "i" "o" , Baseline equals StartFraction, "c" Over "d" , EndFraction equals 3.1 4 1 5 9 2 6 5 3 5 9
R
a
t
i
o
=
c
d
equals
=
3.1 4 1 5 9 2 6 5 3 5 9
3
.
1
4
1
5
9
2
6
5
3
5
9
6
The radius of the circle
The radius of the circle
7
Expression 8: "r" equals StartFraction, "d" Over 2 , EndFraction equals 2.7 2
r
=
d
2
0
0
domain \theta Minimum:
less than or equal to theta less than or equal to
≤
θ
≤
12 pi
1
2
π
domain \theta Maximum:
equals
=
2.7 2
2
.
7
2
8
Expression 9: "x" squared plus "y" squared equals "r" squared Has graph. To audio trace, press ALT+T.
x
2
+
y
2
=
r
2
9
Ratio
Ratio
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"R" "a" "t" "i" "o" equals pi
R
a
t
i
o
=
π
"x"
x
"y"
y
"a" squared
a
2
"a" Superscript, "b" , Baseline
a
b
7
7
8
8
9
9
over
÷
functions
(
(
)
)
less than
<
greater than
>
4
4
5
5
6
6
times
×
| "a" |
|
a
|
,
,
less than or equal to
≤
greater than or equal to
≥
1
1
2
2
3
3
negative
−
A B C
StartRoot, , EndRoot
pi
π
0
0
.
.
equals
=
positive
+
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