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 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.
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.
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.
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.