Mathematical functions and frequently used formulas
pi
round
sqrt
abs
ratio
cmtoin
intocm
sin
cos
tan
asin
acos
atan
For basic mathematical operations, you can use the following signs:
Just as usual, you can place parts of equation into brackets if you want certain actions to be done first, e.g.
For other mathematical operations, please use the following functions:
Here are some formulas you might require when making sewing patterns:
Length of a circle = 2*pi*radius
Trigonometric functions for a triangle with straight angle
sin(a)=AB/OB
cos(a)=OA/OB
tan(a)=AB/OA
Or, if you need to find lengths using angles and length of one of the sides, then:
OB=AB/sin(a)=OA/cos(a)
AB=OB*sin(a)=OA*tan(a)
OA=OB*cos(a)=AB/tan(a)
+
(addition), -
(subtraction), *
(multiplication) and /
(division).Just as usual, you can place parts of equation into brackets if you want certain actions to be done first, e.g.
(a+b)*(c/d)
etc.For other mathematical operations, please use the following functions:
pi | Returns an approximation of pi. |
round(x,precision) | Returns the rounded value of x to specified precision (number of digits after the decimal point). Precision is 0 by default and can be omitted, e.g. round(24.35)=24 |
sqrt(x) | Returns square root of x. |
abs(x) | Returns the absolute value of number (always positive). |
ratio(x/y) | Returns the integer after division, e.g. ratio(11/4) will return 2. |
cmtoin(x) | Helps to convert a value in centimeters into inches. Returns a float rounded to the first decimal, e.g. cmtoin(20) will return 7.9. |
intocm(x) | Helps to convert a value in inches into centimeters. Returns a float rounded to the first decimal, e.g. intocm(8) will return 20.3. |
sin(x) | Returns sine of x (in degrees). |
cos(x) | Returns cosine of x (in degrees). |
tan(x) | Returns tangent of x (in degrees). |
asin(x) | Returns arcsine (in degrees) of x (in degrees). |
acos(x) | Returns arccosine (in degrees) of x. |
atan(x) | Returns arctangent (in degrees) of x. |
Frequently used formulas
Here are some formulas you might require when making sewing patterns:
Length of a circle = 2*pi*radius
Trigonometric functions for a triangle with straight angle
sin(a)=AB/OB
cos(a)=OA/OB
tan(a)=AB/OA
Or, if you need to find lengths using angles and length of one of the sides, then:
OB=AB/sin(a)=OA/cos(a)
AB=OB*sin(a)=OA*tan(a)
OA=OB*cos(a)=AB/tan(a)