This document contains information about the perimeters of regular polygons inside a unit circle and the perimeter of circles with different diameters. It shows that as the number of sides of a regular polygon increases, its perimeter approaches π, the perimeter of a circle with diameter 1 unit. It also provides the formulas that the perimeter of a circle equals π times its diameter and 2π times its radius.

2. A NEW NUMBER

3. Regular polygons inside a
unit circle

4. No: of
Sides
Perimeter of
regular polygon
3 2.5981
4 2.8284
5 2.9389
6 3.0000
7 3.0372
8 3.0615
9 3.0782
10 3.0902
No: of
Sides
Perimeter of
regular polygon
15 3.1187
20 3.1287
25 3.1333
30 3.1359
35 3.1374
40 3.1384
45 3.1390
50 3.1395

5. PERIMETER OF A CIRCLE OF
DIAMETER 1 UNIT IS
APPROXIMATELY EQUAL TO
3.14

8. Perimeter of circle of
diameter 1unit
= π units
Perimeter of circle of
diameter 2 units
= 2π units

9. Perimeter of a circle is π
times its diameter.
Perimeter of a circle is
2π times its radius.

10. d - diameter
r - radius
Perimeter of a circle =
πd
Perimeter of a circle =
2πr