You can save and load the formulas to create a formula library. When RedCrab saves files that include images, RedCrab compresses images without loss of resolution and they are usually smaller than jpeg formats
A quadrilateral is a 2-dimensional closed shape with four straight sides. A Square is a quadrilateral with opposite sides parallel and all sides are equal in length and all angles are equal to 90°.
A parallelogram is a four-sided shape where opposite sides are parallel and equal in length, and opposite angles are equal
RedCrab interprets a series of letters, for example, ab, as different variables (as a and b). It also features implied multiplication. Implied multiplication means you do not need to include the multiplication operator.
A rhombus is a four-sided shape where all sides have equal length. Opposite sides are parallel and opposite angles are equal. Also the diagonals (dashed lines in the figure) of a rhombus bisect each other at right angles.
a trapezoid is a quadrilateral with only one pair of opposite sides parallel and the parallel sides are called bases and the nonparallel sides are called legs.
In RedCrab, you can write several mathematical expressions on one work sheet. The expressions result displays only if terminated with equal sign.
The right triangle has one 90 degree angle and two acute . . . (< 90 degree) angles. The sum of the angles of a triangle is always 180 degrees. The two sides of the triangle that are by the right angle are called the legs... and the side opposite of the right angle is called the hypotenuse.
Side b = base; Side a = height
In the equilateral triangle, all the sides are the same length (congruent) and all the angles are the same size (congruent).
The isosceles triangle has two sides that are the same length (congruent) and two angles that are the same size (congruent).
In geometry (a quadrilateral is a polygon with four sides (or 'edges') and four vertices or corners). A kite is a quadrilateral with two pairs of adjacent, congruent sides.
To find the area of a kite, multiply the lengths of the two diagonals and divide by 2. To find the perimeter of a kite, just add half the lengths of the sides and multiply by 2.
f = short diagonal g = long diagonal
side ab = side dc
angle B = angle D
Circle Information and Reference
A circle - A plane curve everywhere equidistant from a given fixed point, the center.
In RedCrab, with Result boxes you can display formatted results of calculations on any work sheet position. Click Result box on the Insert menu to open a result box.
A result box can be displayed on any position. So you can insert results directly on technical drawings. Result text can be displayed vertically, horizontally or inclined position. The
size of the box is auto fitted to the size of the text.
Pentagon Information and Reference
A Pentagon is a five-sided polygon. The sum of the angles of a pentagon is 540 degrees. The angles in the center are 72 degrees (360/5) = 72
N = number of sides
S = side length
Area aprox. = S² * 1.720477401
or Area = S²N / (4tan(π/N))
Regular Hexagon - a hexagon that is equiangular (all angles are equal in measure) and equilateral (all sides have the same length).
∠ = angle ∠ 30 read as: angle 30
∠ A = ∠ B = ∠ C = ∠ D = ∠ E = ∠ F
Maxima software is useful for manipulation of symbolic and numerical expressions, ordinary differential equations, polynomials, lists, systems of linear equations and sets.
Contents: Addition; Subtraction; The use of Double Signs and Brackets; Multiplication; Division; Simple Equations; The Lowest Common Multiple; Fractions; Quadratic Equations; Simultaneous Equations; Exponential Notation.
an introduction to algebraic concepts for the high school student. Topics include: Equations and Functions, Real Numbers, Equations of Lines, Solving Systems of Equations and Quadratic Equations.
Plane Geometry Formulas. Rectangle: Square: Perimeter: P = 2L + 2W ... Perimeter: add the lengths of all sides. Circumference: C = 2. ? r. Area: A = 2H. B. Area: A ...
This book is a textbook for the course of foundations of geometry. It is addressed to mathematics students in Universities and to High School students for deeper learning the elementary geometry.
For a generation this was the leading textbook on the subject of plane geometry in America. Topics covered: rectilinear figures, the circle, proportion, similar polygons, areas of polygons, regular polygons and circles, etc.
Free Math Help.com - Homework Help on Arithmetic, Pre-Algebra, Beginning Algebra, Intermediate/Advanced Algebra, Geometry and Trig, Calculus, Probability/Statistics.
The National Electric Code (NEC) specifies the following formula to determine acceptable wire size in circular mils (CM) for a constant load of I amps, wire length L in feet, and voltage drop V.
CM = (25 x I x L) / V
V = (25 x I x L) / CM
NEC has established that a 2% maximum voltage drop is acceptable.
The resistance, R, of a length of wire is described by the expression:
R = pL/A
where
p = resistivity of the material composing the wire,
L = length of the wire, and
A = area of the conducting cross section of the wire.