Circles Circumferences Areas

Reference data and engineering information about circles circumferences areas for mathematics applications.

circlescircumferencesareas

Overview

Engineering reference data for Circles Circumferences Areas in mathematics.

Key Formulas

Quadratic Formula

$x = \frac{-b \pm \sqrt{b^2 - 4ac}}{2a}$

Roots of ax² + bx + c = 0.

Pythagorean Theorem

$c^2 = a^2 + b^2$

Right triangle relationship.

Circle Area

$A = \pi r^2$

Area of a circle.

Logarithm

$\log_b(x) = \frac{\ln(x)}{\ln(b)}$

Change of base formula.

Variables

Symbol	Description	Unit
$\pi$	Pi	3.14159...
$e$	Euler's number	2.71828...

Data Table

140 rows

Diameter (in) / Circumference (in) / Area (in2) data
col0
1
1
3
1
3
1
5
3
7
1
9
5
11
3
13
7
15
1
17
9
19
5
21
11
23
3
25
13
27
7
29
15
31
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
3
3
3
3
3
3
3
3
3
3
3
3
3
3
3
4
4
4
4
4
4
4
4
4
4
4
4
4
4
5
5
5
5
5
5
5
5
5
5
5
5
5
5
6
6
6
6
6
6
6
7
7
7
7
7
7
7
8
8
8
8
8
8
8
9
9
9
9
9
9
9
10
10
10
10
10
10

Source: engineeringtoolbox.com

References

Original Source

Source: engineeringtoolbox.com