WHAT IS π ?
UNROLL A CIRCLE · FIND 3.14
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Unroll a Circle
π = C / d
0.14
d
r
d
=
diameter
C
=
circumference
A
=
area
1. Formulas
C = 2πr = πd
A = πr²
r =
→ C =
, A =
2. π Facts
π ≈
3.14159265…
(it never ends)
As a fraction:
π ≈ 22 / 7
3. Remember
Diameter = 2 × radius
In every circle C ÷ d = π (the same)
MATRIC MATHS · CIRCLES · PUNJAB BOARDS
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